Ozzie Gooen
GitHub
commit
3f901a1102
179
__tests__/CDF__Test.re
Normal file
179
__tests__/CDF__Test.re
Normal file
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@ -0,0 +1,179 @@
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open Jest;
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open Expect;
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exception ShapeWrong(string);
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describe("CDF", () => {
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test("raise - w/o order", () => {
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expect(() => {
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module Cdf =
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CDF.Make({
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let shape: DistTypes.xyShape = {
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xs: [|10., 4., 8.|],
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ys: [|8., 9., 2.|],
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};
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});
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();
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})
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|> toThrow
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});
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test("raise - with order", () => {
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expect(() => {
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module Cdf =
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CDF.Make({
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let shape: DistTypes.xyShape = {
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xs: [|1., 4., 8.|],
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ys: [|8., 9., 2.|],
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};
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});
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();
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})
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|> not_
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|> toThrow
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});
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test("order#1", () => {
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let a = CDF.order({xs: [|1., 4., 8.|], ys: [|8., 9., 2.|]});
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let b: DistTypes.xyShape = {xs: [|1., 4., 8.|], ys: [|8., 9., 2.|]};
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expect(a) |> toEqual(b);
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});
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test("order#2", () => {
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let a = CDF.order({xs: [|10., 5., 12.|], ys: [|8., 9., 2.|]});
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let b: DistTypes.xyShape = {xs: [|5., 10., 12.|], ys: [|9., 8., 2.|]};
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expect(a) |> toEqual(b);
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});
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describe("minX - maxX", () => {
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module Dist =
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CDF.Make({
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let shape = CDF.order({xs: [|20., 4., 8.|], ys: [|8., 9., 2.|]});
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});
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test("minX", () => {
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expect(Dist.minX()) |> toEqual(4.)
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});
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test("maxX", () => {
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expect(Dist.maxX()) |> toEqual(20.)
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});
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});
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describe("findY", () => {
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module Dist =
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CDF.Make({
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let shape = CDF.order({xs: [|1., 2., 3.|], ys: [|5., 6., 7.|]});
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});
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test("#1", () => {
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expect(Dist.findY(1.)) |> toEqual(5.)
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});
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test("#2", () => {
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expect(Dist.findY(1.5)) |> toEqual(5.5)
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});
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test("#3", () => {
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expect(Dist.findY(3.)) |> toEqual(7.)
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});
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test("#4", () => {
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expect(Dist.findY(4.)) |> toEqual(7.)
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});
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test("#5", () => {
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expect(Dist.findY(15.)) |> toEqual(7.)
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});
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test("#6", () => {
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expect(Dist.findY(-1.)) |> toEqual(5.)
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});
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});
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describe("findX", () => {
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module Dist =
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CDF.Make({
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let shape = CDF.order({xs: [|1., 2., 3.|], ys: [|5., 6., 7.|]});
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});
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test("#1", () => {
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expect(Dist.findX(5.)) |> toEqual(1.)
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});
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test("#2", () => {
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expect(Dist.findX(7.)) |> toEqual(3.)
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});
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test("#3", () => {
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expect(Dist.findX(5.5)) |> toEqual(1.5)
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});
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test("#4", () => {
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expect(Dist.findX(8.)) |> toEqual(3.)
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});
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test("#5", () => {
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expect(Dist.findX(4.)) |> toEqual(1.)
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});
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});
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describe("convertWithAlternativeXs", () => {
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open Functions;
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let xs = up(1, 9);
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let ys = up(20, 28);
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module Dist =
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CDF.Make({
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let shape = CDF.order({xs, ys});
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});
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let xs2 = up(3, 7);
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module Dist2 =
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CDF.Make({
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let shape = Dist.convertWithAlternativeXs(xs2);
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});
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test("#1", () => {
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expect(Dist2.xs) |> toEqual([|3., 4., 5., 6., 7.|])
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});
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test("#2", () => {
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expect(Dist2.ys) |> toEqual([|22., 23., 24., 25., 26.|])
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});
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});
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describe("convertToNewLength", () => {
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open Functions;
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let xs = up(1, 9);
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let ys = up(50, 58);
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module Dist =
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CDF.Make({
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let shape = CDF.order({xs, ys});
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});
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module Dist2 =
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CDF.Make({
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let shape = Dist.convertToNewLength(3);
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});
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test("#1", () => {
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expect(Dist2.xs) |> toEqual([|1., 5., 9.|])
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});
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test("#2", () => {
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expect(Dist2.ys) |> toEqual([|50., 54., 58.|])
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});
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});
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// @todo: Should each test expect 70.?
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describe("sample", () => {
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open Functions;
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let xs = up(1, 9);
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let ys = up(70, 78);
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module Dist =
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CDF.Make({
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let shape = CDF.order({xs, ys});
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});
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let xs2 = Dist.sample(3);
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test("#1", () => {
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expect(xs2[0]) |> toBe(70.)
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});
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test("#2", () => {
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expect(xs2[1]) |> toBe(70.)
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});
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test("#3", () => {
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expect(xs2[2]) |> toBe(70.)
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});
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});
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describe("integral", () => {
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module Dist =
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CDF.Make({
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let shape =
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CDF.order({xs: [|0., 1., 2., 4.|], ys: [|0.0, 1.0, 2.0, 2.0|]});
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});
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test("with regular inputs", () => {
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expect(Dist.integral()) |> toBe(6.)
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});
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});
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});
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92
__tests__/Functions__Test.re
Normal file
92
__tests__/Functions__Test.re
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@ -0,0 +1,92 @@
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open Jest;
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open Expect;
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exception ShapeWrong(string);
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describe("Functions", () => {
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test("interpolate", () => {
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let a = Functions.interpolate(10., 20., 1., 2., 15.);
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let b = 1.5;
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expect(a) |> toEqual(b);
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});
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test("range#1", () => {
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expect(Functions.range(1., 5., 3)) |> toEqual([|1., 3., 5.|])
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});
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test("range#2", () => {
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expect(Functions.range(1., 5., 5)) |> toEqual([|1., 2., 3., 4., 5.|])
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});
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test("range#3", () => {
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expect(Functions.range(-10., 15., 2)) |> toEqual([|(-10.), 15.|])
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});
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test("range#4", () => {
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expect(Functions.range(-10., 15., 3)) |> toEqual([|(-10.), 2.5, 15.|])
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});
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test("range#5", () => {
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expect(Functions.range(-10.3, 17., 3))
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|> toEqual([|(-10.3), 3.3499999999999996, 17.|])
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});
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test("range#6", () => {
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expect(Functions.range(-10.3, 17., 5))
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|> toEqual([|
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(-10.3),
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(-3.4750000000000005),
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3.3499999999999996,
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10.175,
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17.0,
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|])
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});
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test("range#7", () => {
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expect(Functions.range(-10.3, 17.31, 3))
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|> toEqual([|(-10.3), 3.504999999999999, 17.31|])
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});
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test("range#8", () => {
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expect(Functions.range(1., 1., 3)) |> toEqual([|1., 1., 1.|])
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});
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test("mean#1", () => {
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expect(Functions.mean([|1., 2., 3.|])) |> toEqual(2.)
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});
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test("mean#2", () => {
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expect(Functions.mean([|1., 2., 3., (-2.)|])) |> toEqual(1.)
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});
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test("mean#3", () => {
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expect(Functions.mean([|1., 2., 3., (-2.), (-10.)|])) |> toEqual(-1.2)
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});
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test("min#1", () => {
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expect(Functions.min([|1., 2., 3.|])) |> toEqual(1.)
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});
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test("min#2", () => {
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expect(Functions.min([|(-1.), (-2.), 0., 20.|])) |> toEqual(-2.)
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});
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test("min#3", () => {
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expect(Functions.min([|(-1.), (-2.), 0., 20., (-2.2)|]))
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|> toEqual(-2.2)
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});
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test("max#1", () => {
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expect(Functions.max([|1., 2., 3.|])) |> toEqual(3.)
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});
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test("max#2", () => {
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expect(Functions.max([|(-1.), (-2.), 0., 20.|])) |> toEqual(20.)
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});
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test("max#3", () => {
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expect(Functions.max([|(-1.), (-2.), 0., (-2.2)|])) |> toEqual(0.)
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});
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test("random#1", () => {
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expect(Functions.random(1, 5)) |> toBeLessThanOrEqual(5)
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});
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test("random#2", () => {
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expect(Functions.random(1, 5)) |> toBeGreaterThanOrEqual(1)
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});
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test("up#1", () => {
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expect(Functions.up(1, 5)) |> toEqual([|1., 2., 3., 4., 5.|])
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});
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test("up#2", () => {
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expect(Functions.up(-1, 5))
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|> toEqual([|(-1.), 0., 1., 2., 3., 4., 5.|])
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});
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test("down#1", () => {
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expect(Functions.down(5, 1)) |> toEqual([|5., 4., 3., 2., 1.|])
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});
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test("down#2", () => {
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expect(Functions.down(5, -1))
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|> toEqual([|5., 4., 3., 2., 1., 0., (-1.)|])
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});
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});
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@ -1,11 +0,0 @@
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'use strict';
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var React = require("react");
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var ReactDOMRe = require("reason-react/src/ReactDOMRe.js");
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var App$ProbExample = require("./App.bs.js");
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((import('./styles/index.css')));
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ReactDOMRe.renderToElementWithId(React.createElement(App$ProbExample.make, { }), "app");
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/* Not a pure module */
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@ -1,174 +1,170 @@
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const {
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Cdf,
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Pdf,
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ContinuousDistribution,
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ContinuousDistributionCombination,
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scoringFunctions,
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} = require("@foretold/cdf/lib");
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const _ = require("lodash");
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Cdf,
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Pdf,
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ContinuousDistribution,
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ContinuousDistributionCombination,
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scoringFunctions,
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} = require("@foretold/cdf/lib");
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const _ = require("lodash");
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/**
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*
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* @param xs
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* @param ys
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* @returns {{ys: *, xs: *}}
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*/
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function cdfToPdf({ xs, ys }) {
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let cdf = new Cdf(xs, ys);
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let pdf = cdf.toPdf();
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return { xs: pdf.xs, ys: pdf.ys };
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}
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/**
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*
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* @param xs
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* @param ys
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* @returns {{ys: *, xs: *}}
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*/
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function cdfToPdf({ xs, ys }) {
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let cdf = new Cdf(xs, ys);
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let pdf = cdf.toPdf();
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return { xs: pdf.xs, ys: pdf.ys };
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}
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/**
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*
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* @param xs
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* @param ys
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* @returns {{ys: *, xs: *}}
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*/
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function pdfToCdf({ xs, ys }) {
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let cdf = new Pdf(xs, ys);
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let pdf = cdf.toCdf();
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return { xs: pdf.xs, ys: pdf.ys };
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}
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/**
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*
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* @param xs
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* @param ys
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* @returns {{ys: *, xs: *}}
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*/
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function pdfToCdf({ xs, ys }) {
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let cdf = new Pdf(xs, ys);
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let pdf = cdf.toCdf();
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return { xs: pdf.xs, ys: pdf.ys };
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}
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/**
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*
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* @param sampleCount
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* @param vars
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* @returns {{ys: *, xs: *}}
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*/
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function mean(sampleCount, vars) {
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let cdfs = vars.map(r => new Cdf(r.xs, r.ys));
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let comb = new ContinuousDistributionCombination(cdfs);
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let newCdf = comb.combineYsWithMean(sampleCount);
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/**
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*
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* @param sampleCount
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* @param vars
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* @returns {{ys: *, xs: *}}
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*/
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function mean(sampleCount, vars) {
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let cdfs = vars.map(r => new Cdf(r.xs, r.ys));
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let comb = new ContinuousDistributionCombination(cdfs);
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let newCdf = comb.combineYsWithMean(sampleCount);
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return { xs: newCdf.xs, ys: newCdf.ys };
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}
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return { xs: newCdf.xs, ys: newCdf.ys };
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}
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/**
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*
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* @param sampleCount
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* @param predictionCdf
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* @param resolutionCdf
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*/
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function scoreNonMarketCdfCdf(sampleCount, predictionCdf, resolutionCdf, resolutionUniformAdditionWeight=0) {
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let toCdf = (r) => (new Cdf(r.xs, r.ys));
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let prediction = toCdf(predictionCdf);
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if (_.isFinite(resolutionUniformAdditionWeight)){
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prediction = prediction.combineWithUniformOfCdf(
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{
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cdf: toCdf(resolutionCdf),
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uniformWeight: resolutionUniformAdditionWeight,
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sampleCount
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}
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);
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}
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return scoringFunctions.distributionInputDistributionOutputMarketless({
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predictionCdf: prediction,
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resultCdf: toCdf(resolutionCdf),
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sampleCount,
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});
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}
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|
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/**
|
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*
|
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* @param sampleCount
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* @param cdf
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*/
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function differentialEntropy(sampleCount, cdf) {
|
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let toCdf = (r) => (new Cdf(r.xs, r.ys));
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|
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return scoringFunctions.differentialEntropy({
|
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cdf: toCdf(cdf),
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sampleCount: sampleCount
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});
|
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}
|
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|
||||
/**
|
||||
*
|
||||
* @param x
|
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* @param xs
|
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* @param ys
|
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* @returns {number}
|
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*/
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function findY(x, { xs, ys }) {
|
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let cdf = new Cdf(xs, ys);
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return cdf.findY(x);
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}
|
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|
||||
/**
|
||||
*
|
||||
* @param x
|
||||
* @param xs
|
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* @param ys
|
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* @returns {number[]}
|
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*/
|
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function convertToNewLength(n, { xs, ys }) {
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let dist = new ContinuousDistribution(xs, ys);
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return dist.convertToNewLength(n);
|
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}
|
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|
||||
/**
|
||||
*
|
||||
* @param y
|
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* @param xs
|
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* @param ys
|
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* @returns {number}
|
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*/
|
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function findX(y, { xs, ys }) {
|
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let cdf = new Cdf(xs, ys);
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return cdf.findX(y);
|
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}
|
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|
||||
/**
|
||||
*
|
||||
* @param xs
|
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* @param ys
|
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* @returns {number[]}
|
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*/
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function integral({ xs, ys }) {
|
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if (_.includes(ys, NaN)){
|
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return NaN;
|
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}
|
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else if (_.includes(ys, Infinity) && _.includes(ys, -Infinity)){
|
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return NaN;
|
||||
}
|
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else if (_.includes(ys, Infinity)){
|
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return Infinity;
|
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}
|
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else if (_.includes(ys, -Infinity)){
|
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return -Infinity;
|
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}
|
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|
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let integral = 0;
|
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for (let i = 1; i < ys.length; i++) {
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let thisY = ys[i];
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let lastY = ys[i - 1];
|
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let thisX = xs[i];
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let lastX = xs[i - 1];
|
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|
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if (
|
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_.isFinite(thisY) && _.isFinite(lastY) &&
|
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_.isFinite(thisX) && _.isFinite(lastX)
|
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) {
|
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let sectionInterval = ((thisY + lastY) / 2) * (thisX - lastX);
|
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integral = integral + sectionInterval;
|
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/**
|
||||
*
|
||||
* @param sampleCount
|
||||
* @param predictionCdf
|
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* @param resolutionCdf
|
||||
*/
|
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function scoreNonMarketCdfCdf(sampleCount, predictionCdf, resolutionCdf, resolutionUniformAdditionWeight = 0) {
|
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let toCdf = (r) => (new Cdf(r.xs, r.ys));
|
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let prediction = toCdf(predictionCdf);
|
||||
if (_.isFinite(resolutionUniformAdditionWeight)) {
|
||||
prediction = prediction.combineWithUniformOfCdf(
|
||||
{
|
||||
cdf: toCdf(resolutionCdf),
|
||||
uniformWeight: resolutionUniformAdditionWeight,
|
||||
sampleCount
|
||||
}
|
||||
|
||||
}
|
||||
return integral;
|
||||
);
|
||||
}
|
||||
|
||||
module.exports = {
|
||||
cdfToPdf,
|
||||
pdfToCdf,
|
||||
findY,
|
||||
findX,
|
||||
convertToNewLength,
|
||||
mean,
|
||||
scoreNonMarketCdfCdf,
|
||||
differentialEntropy,
|
||||
integral,
|
||||
};
|
||||
return scoringFunctions.distributionInputDistributionOutputMarketless({
|
||||
predictionCdf: prediction,
|
||||
resultCdf: toCdf(resolutionCdf),
|
||||
sampleCount,
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
* @param sampleCount
|
||||
* @param cdf
|
||||
*/
|
||||
function differentialEntropy(sampleCount, cdf) {
|
||||
let toCdf = (r) => (new Cdf(r.xs, r.ys));
|
||||
|
||||
return scoringFunctions.differentialEntropy({
|
||||
cdf: toCdf(cdf),
|
||||
sampleCount: sampleCount
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
* @param x
|
||||
* @param xs
|
||||
* @param ys
|
||||
* @returns {number}
|
||||
*/
|
||||
function findY(x, { xs, ys }) {
|
||||
let cdf = new Cdf(xs, ys);
|
||||
return cdf.findY(x);
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
* @param x
|
||||
* @param xs
|
||||
* @param ys
|
||||
* @returns {number[]}
|
||||
*/
|
||||
function convertToNewLength(n, { xs, ys }) {
|
||||
let dist = new ContinuousDistribution(xs, ys);
|
||||
return dist.convertToNewLength(n);
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
* @param y
|
||||
* @param xs
|
||||
* @param ys
|
||||
* @returns {number}
|
||||
*/
|
||||
function findX(y, { xs, ys }) {
|
||||
let cdf = new Cdf(xs, ys);
|
||||
return cdf.findX(y);
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
* @param xs
|
||||
* @param ys
|
||||
* @returns {number[]}
|
||||
*/
|
||||
function integral({ xs, ys }) {
|
||||
if (_.includes(ys, NaN)) {
|
||||
return NaN;
|
||||
} else if (_.includes(ys, Infinity) && _.includes(ys, -Infinity)) {
|
||||
return NaN;
|
||||
} else if (_.includes(ys, Infinity)) {
|
||||
return Infinity;
|
||||
} else if (_.includes(ys, -Infinity)) {
|
||||
return -Infinity;
|
||||
}
|
||||
|
||||
let integral = 0;
|
||||
for (let i = 1; i < ys.length; i++) {
|
||||
let thisY = ys[i];
|
||||
let lastY = ys[i - 1];
|
||||
let thisX = xs[i];
|
||||
let lastX = xs[i - 1];
|
||||
|
||||
if (
|
||||
_.isFinite(thisY) && _.isFinite(lastY) &&
|
||||
_.isFinite(thisX) && _.isFinite(lastX)
|
||||
) {
|
||||
let sectionInterval = ((thisY + lastY) / 2) * (thisX - lastX);
|
||||
integral = integral + sectionInterval;
|
||||
}
|
||||
|
||||
}
|
||||
return integral;
|
||||
}
|
||||
|
||||
module.exports = {
|
||||
cdfToPdf,
|
||||
pdfToCdf,
|
||||
findY,
|
||||
findX,
|
||||
convertToNewLength,
|
||||
mean,
|
||||
scoreNonMarketCdfCdf,
|
||||
differentialEntropy,
|
||||
integral,
|
||||
};
|
||||
|
|
|
|||
107
src/utility/lib/CDF.re
Normal file
107
src/utility/lib/CDF.re
Normal file
|
|
@ -0,0 +1,107 @@
|
|||
module type Config = {let shape: DistTypes.xyShape;};
|
||||
|
||||
exception ShapeWrong(string);
|
||||
|
||||
let order = (shape: DistTypes.xyShape): DistTypes.xyShape => {
|
||||
let xy =
|
||||
shape.xs
|
||||
|> Array.mapi((i, x) => [x, shape.ys |> Array.get(_, i)])
|
||||
|> Belt.SortArray.stableSortBy(_, ([a, _], [b, _]) => a > b ? 1 : (-1));
|
||||
{
|
||||
xs: xy |> Array.map(([x, _]) => x),
|
||||
ys: xy |> Array.map(([_, y]) => y),
|
||||
};
|
||||
};
|
||||
|
||||
module Make = (Config: Config) => {
|
||||
let xs = Config.shape.xs;
|
||||
let ys = Config.shape.ys;
|
||||
let get = Array.get;
|
||||
let len = Array.length;
|
||||
|
||||
let validateHasLength = (): bool => len(xs) > 0;
|
||||
let validateSize = (): bool => len(xs) == len(ys);
|
||||
if (!validateHasLength()) {
|
||||
raise(ShapeWrong("You need at least one element."));
|
||||
};
|
||||
if (!validateSize()) {
|
||||
raise(ShapeWrong("Arrays of \"xs\" and \"ys\" have different sizes."));
|
||||
};
|
||||
if (!Belt.SortArray.isSorted(xs, (a, b) => a > b ? 1 : (-1))) {
|
||||
raise(ShapeWrong("Arrays of \"xs\" and \"ys\" have different sizes."));
|
||||
};
|
||||
let minX = () => get(xs, 0);
|
||||
let maxX = () => get(xs, len(xs) - 1);
|
||||
let minY = () => get(ys, 0);
|
||||
let maxY = () => get(ys, len(ys) - 1);
|
||||
let findY = (x: float): float => {
|
||||
let firstHigherIndex = Belt.Array.getIndexBy(xs, e => e >= x);
|
||||
switch (firstHigherIndex) {
|
||||
| None => maxY()
|
||||
| Some(0) => minY()
|
||||
| Some(firstHigherIndex) =>
|
||||
let lowerOrEqualIndex =
|
||||
firstHigherIndex - 1 < 0 ? 0 : firstHigherIndex - 1;
|
||||
let needsInterpolation = get(xs, lowerOrEqualIndex) != x;
|
||||
if (needsInterpolation) {
|
||||
Functions.interpolate(
|
||||
get(xs, lowerOrEqualIndex),
|
||||
get(xs, firstHigherIndex),
|
||||
get(ys, lowerOrEqualIndex),
|
||||
get(ys, firstHigherIndex),
|
||||
x,
|
||||
);
|
||||
} else {
|
||||
ys[lowerOrEqualIndex];
|
||||
};
|
||||
};
|
||||
};
|
||||
let findX = (y: float): float => {
|
||||
let firstHigherIndex = Belt.Array.getIndexBy(ys, e => e >= y);
|
||||
switch (firstHigherIndex) {
|
||||
| None => maxX()
|
||||
| Some(0) => minX()
|
||||
| Some(firstHigherIndex) =>
|
||||
let lowerOrEqualIndex =
|
||||
firstHigherIndex - 1 < 0 ? 0 : firstHigherIndex - 1;
|
||||
let needsInterpolation = get(ys, lowerOrEqualIndex) != y;
|
||||
if (needsInterpolation) {
|
||||
Functions.interpolate(
|
||||
get(ys, lowerOrEqualIndex),
|
||||
get(ys, firstHigherIndex),
|
||||
get(xs, lowerOrEqualIndex),
|
||||
get(xs, firstHigherIndex),
|
||||
y,
|
||||
);
|
||||
} else {
|
||||
xs[lowerOrEqualIndex];
|
||||
};
|
||||
};
|
||||
};
|
||||
let convertWithAlternativeXs = (newXs: array(float)): DistTypes.xyShape => {
|
||||
let newYs = Belt.Array.map(newXs, findY);
|
||||
{xs: newXs, ys: newYs};
|
||||
};
|
||||
let convertToNewLength = (newLength: int): DistTypes.xyShape => {
|
||||
Functions.(
|
||||
range(min(xs), max(xs), newLength) |> convertWithAlternativeXs
|
||||
);
|
||||
};
|
||||
let sampleSingle = (): float => Js.Math.random() |> findY;
|
||||
let sample = (size: int): array(float) =>
|
||||
Belt.Array.makeBy(size, i => sampleSingle());
|
||||
let integral = () => {
|
||||
Belt.Array.reduceWithIndex(ys, 0., (integral, y, i) => {
|
||||
switch (i) {
|
||||
| 0 => integral
|
||||
| _ =>
|
||||
let thisY = y;
|
||||
let lastY = get(ys, i - 1);
|
||||
let thisX = get(xs, i);
|
||||
let lastX = get(xs, i - 1);
|
||||
let sectionInterval = (thisY +. lastY) /. 2. *. (thisX -. lastX);
|
||||
integral +. sectionInterval;
|
||||
}
|
||||
});
|
||||
};
|
||||
};
|
||||
36
src/utility/lib/Functions.re
Normal file
36
src/utility/lib/Functions.re
Normal file
|
|
@ -0,0 +1,36 @@
|
|||
exception RangeWrong(string);
|
||||
|
||||
let interpolate =
|
||||
(xMin: float, xMax: float, yMin: float, yMax: float, xIntended: float)
|
||||
: float => {
|
||||
let minProportion = (xMax -. xIntended) /. (xMax -. xMin);
|
||||
let maxProportion = (xIntended -. xMin) /. (xMax -. xMin);
|
||||
yMin *. minProportion +. yMax *. maxProportion;
|
||||
};
|
||||
|
||||
let sum = Belt.Array.reduce(_, 0., (i, j) => i +. j);
|
||||
let mean = a => sum(a) /. (Array.length(a) |> float_of_int);
|
||||
let min = a => Belt.Array.reduce(a, a[0], (i, j) => i < j ? i : j);
|
||||
let max = a => Belt.Array.reduce(a, a[0], (i, j) => i > j ? i : j);
|
||||
let up = (a, b) =>
|
||||
Array.make(b - a + 1, a)
|
||||
|> Array.mapi((i, c) => c + i)
|
||||
|> Belt.Array.map(_, float_of_int);
|
||||
let down = (a, b) =>
|
||||
Array.make(a - b + 1, a)
|
||||
|> Array.mapi((i, c) => c - i)
|
||||
|> Belt.Array.map(_, float_of_int);
|
||||
let range = (min: float, max: float, n: int): array(float) => {
|
||||
switch (n) {
|
||||
| 0 => [||]
|
||||
| 1 => [|min|]
|
||||
| 2 => [|min, max|]
|
||||
| _ when min == max => Belt.Array.make(n, min)
|
||||
| _ when n < 0 => raise(RangeWrong("n is less then zero"))
|
||||
| _ when min > max => raise(RangeWrong("Min values is less then max"))
|
||||
| _ =>
|
||||
let diff = (max -. min) /. Belt.Float.fromInt(n - 1);
|
||||
Belt.Array.makeBy(n, i => {min +. Belt.Float.fromInt(i) *. diff});
|
||||
};
|
||||
};
|
||||
let random = Js.Math.random_int;
|
||||
Loading…
Reference in New Issue
Block a user