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NunoSempere 2024-06-19 09:46:08 -04:00
parent 4d146dbcfb
commit 2924f174a6
2 changed files with 142 additions and 144 deletions
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285
f.go
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@ -59,7 +59,6 @@ func (ln Lognormal) Samples() []float64 {
func (beta Beta) Samples() []float64 {
sampler := func(r sample.Src) float64 { return sample.Sample_beta(beta.a, beta.b, r) }
// return sample.Sample_parallel(sampler, N_SAMPLES)
return sample.Sample_serially(sampler, N_SAMPLES)
}
@ -68,7 +67,7 @@ func (fs FilledSamples) Samples() []float64 {
}
/* Constants */
const GENERAL_ERR_MSG = " Operation | Variable assignment | Special\n" +
const HELP_MSG = " Operation | Variable assignment | Special\n" +
" Operation: operator operand\n" +
" operator: (empty) | * | / | + | -\n" +
" operand: scalar | lognormal | beta | variable\n" +
@ -94,131 +93,55 @@ const NORMAL90CONFIDENCE = 1.6448536269514727
const INIT_DIST Scalar = Scalar(1)
const N_SAMPLES = 100_000
/* Pretty print for distributions */
// Needs types
/* Printers */
func prettyPrintDist(dist Dist) {
switch v := dist.(type) {
case Lognormal:
fmt.Printf("=> ")
pretty.PrettyPrint2Floats(v.low, v.high)
case FilledSamples:
tmp_xs := make([]float64, N_SAMPLES)
copy(tmp_xs, v.xs)
sort.Slice(tmp_xs, func(i, j int) bool {
return tmp_xs[i] < tmp_xs[j]
})
low_int := N_SAMPLES / 20
low := tmp_xs[low_int]
high_int := N_SAMPLES * 19 / 20
high := tmp_xs[high_int]
fmt.Printf("=> ")
pretty.PrettyPrintFloat(low)
fmt.Printf(" ")
pretty.PrettyPrintFloat(high)
fmt.Printf(" (")
pretty.PrettyPrintInt(N_SAMPLES)
fmt.Printf(" samples)\n")
fmt.Println()
case Beta:
fmt.Printf("=> beta ")
pretty.PrettyPrint2Floats(v.a, v.b)
fmt.Println()
case Scalar:
fmt.Printf("=> scalar ")
w := float64(v)
pretty.PrettyPrintFloat(w)
fmt.Println()
case FilledSamples:
sorted_xs := make([]float64, N_SAMPLES)
copy(sorted_xs, v.xs)
sort.Slice(sorted_xs, func(i, j int) bool {
return sorted_xs[i] < sorted_xs[j]
})
low := sorted_xs[N_SAMPLES/20]
high := sorted_xs[N_SAMPLES*19/20]
fmt.Printf("=> ")
pretty.PrettyPrint2Floats(low, high)
fmt.Printf(" (")
pretty.PrettyPrintInt(N_SAMPLES)
fmt.Printf(" samples)")
fmt.Println()
default:
fmt.Printf("%v", v)
fmt.Printf("%v\n", v)
}
}
// Parse line into Distribution
func parseLineErr(err_msg string) (string, Dist, error) {
fmt.Println(GENERAL_ERR_MSG)
func printAndReturnErr(err_msg string) error {
fmt.Println(err_msg)
var errorDist Dist
return "", errorDist, errors.New(err_msg)
}
func parseLineIntoOpAndDist(line string, vars map[string]Dist) (string, Dist, error) {
words := strings.Split(strings.TrimSpace(line), " ")
op := ""
var dist Dist
switch words[0] {
case "*", "/", "+", "-":
op = words[0]
words = words[1:]
default:
op = "*" // later, change the below to
}
switch len(words) {
case 0:
return parseLineErr("Operator must have operand; can't operate on nothing")
case 1:
var_word, var_word_exists := vars[words[0]]
single_float, err1 := strconv.ParseFloat(words[0], 64) // abstract this away to search for K/M/B/T/etc.
switch {
case var_word_exists:
dist = var_word
case err1 == nil:
dist = Scalar(single_float)
case err1 != nil && !var_word_exists:
return parseLineErr("Trying to operate on a scalar, but scalar is neither a float nor an assigned variable")
}
case 2:
new_low, err1 := strconv.ParseFloat(words[0], 64)
new_high, err2 := strconv.ParseFloat(words[1], 64)
if err1 != nil || err2 != nil {
return parseLineErr("Trying to operate by a distribution, but distribution is not specified as two floats")
}
dist = Lognormal{low: new_low, high: new_high}
case 3:
if words[0] == "beta" || words[0] == "b" {
a, err1 := strconv.ParseFloat(words[1], 64)
b, err2 := strconv.ParseFloat(words[2], 64)
if err1 != nil || err2 != nil {
return parseLineErr("Trying to specify a beta distribution? Try beta 1 2")
}
dist = Beta{a: a, b: b}
} else {
return parseLineErr("Input not understood or not implemented yet")
}
default:
return parseLineErr("Input not understood or not implemented yet")
}
return op, dist, nil
}
func multiplyLogDists(l1 Lognormal, l2 Lognormal) Lognormal {
logmean1 := (math.Log(l1.high) + math.Log(l1.low)) / 2.0
logstd1 := (math.Log(l1.high) - math.Log(l1.low)) / (2.0 * NORMAL90CONFIDENCE)
logmean2 := (math.Log(l2.high) + math.Log(l2.low)) / 2.0
logstd2 := (math.Log(l2.high) - math.Log(l2.low)) / (2.0 * NORMAL90CONFIDENCE)
logmean_product := logmean1 + logmean2
logstd_product := math.Sqrt(logstd1*logstd1 + logstd2*logstd2)
h := logstd_product * NORMAL90CONFIDENCE
loglow := logmean_product - h
loghigh := logmean_product + h
return Lognormal{low: math.Exp(loglow), high: math.Exp(loghigh)}
}
func multiplyBetaDists(beta1 Beta, beta2 Beta) Beta {
return Beta{a: beta1.a + beta2.a, b: beta1.b + beta2.b}
fmt.Println(HELP_MSG)
return errors.New(err_msg)
}
/* Operations */
// Generic operations with samples
func operateDistsAsSamples(dist1 Dist, dist2 Dist, op string) (Dist, error) {
xs := dist1.Samples()
ys := dist2.Samples()
// fmt.Printf("xs: %v\n", xs)
// fmt.Printf("ys: %v\n", ys)
zs := make([]float64, N_SAMPLES)
for i := 0; i < N_SAMPLES; i++ {
@ -243,6 +166,28 @@ func operateDistsAsSamples(dist1 Dist, dist2 Dist, op string) (Dist, error) {
return FilledSamples{xs: zs}, nil
}
// Multiplication
func multiplyLogDists(l1 Lognormal, l2 Lognormal) Lognormal {
logmean1 := (math.Log(l1.high) + math.Log(l1.low)) / 2.0
logstd1 := (math.Log(l1.high) - math.Log(l1.low)) / (2.0 * NORMAL90CONFIDENCE)
logmean2 := (math.Log(l2.high) + math.Log(l2.low)) / 2.0
logstd2 := (math.Log(l2.high) - math.Log(l2.low)) / (2.0 * NORMAL90CONFIDENCE)
logmean_product := logmean1 + logmean2
logstd_product := math.Sqrt(logstd1*logstd1 + logstd2*logstd2)
h := logstd_product * NORMAL90CONFIDENCE
loglow := logmean_product - h
loghigh := logmean_product + h
return Lognormal{low: math.Exp(loglow), high: math.Exp(loghigh)}
}
func multiplyBetaDists(beta1 Beta, beta2 Beta) Beta {
return Beta{a: beta1.a + beta2.a, b: beta1.b + beta2.b}
}
func multiplyDists(old_dist Dist, new_dist Dist) (Dist, error) {
switch o := old_dist.(type) {
@ -291,9 +236,17 @@ func divideDists(old_dist Dist, new_dist Dist) (Dist, error) {
switch n := new_dist.(type) {
case Lognormal:
// to do: check division by zero
if n.high == 0 || n.low == 0 {
fmt.Println("Error: Can't divide by 0.0")
return nil, errors.New("Error: division by zero")
}
return multiplyLogDists(o, Lognormal{low: 1.0 / n.high, high: 1.0 / n.low}), nil
case Scalar:
// to do: check division by zero
if n == 0.0 {
fmt.Println("Error: Can't divide by 0.0")
return nil, errors.New("Error: division by zero scalar")
}
return multiplyLogDists(o, Lognormal{low: 1.0 / float64(n), high: 1.0 / float64(n)}), nil
default:
return operateDistsAsSamples(old_dist, new_dist, "/")
@ -306,6 +259,10 @@ func divideDists(old_dist Dist, new_dist Dist) (Dist, error) {
return multiplyLogDists(Lognormal{low: float64(o), high: float64(o)}, Lognormal{low: 1.0 / n.high, high: 1.0 / n.low}), nil
case Scalar:
// to do: check division by zero
if n == 0.0 {
fmt.Println("Error: Can't divide by 0.0")
return nil, errors.New("Error: division by zero scalar")
}
return Scalar(float64(o) / float64(n)), nil
default:
return operateDistsAsSamples(old_dist, new_dist, "/")
@ -316,94 +273,136 @@ func divideDists(old_dist Dist, new_dist Dist) (Dist, error) {
}
}
/* Combine old dist and new line */
// We want this as a function to be able to have parenthesis/recusion, possibly functions
func operateStackWithDist(stack Stack, new_dist Dist, op string) Stack {
var combined_dist Dist
var err error
// Generic distribution operations
func operateDists(old_dist Dist, new_dist Dist, op string) (Dist, error) {
switch op {
case "*":
if combined_dist, err = multiplyDists(stack.old_dist, new_dist); err == nil {
stack.old_dist = combined_dist
}
return multiplyDists(old_dist, new_dist)
case "/":
if combined_dist, err = divideDists(stack.old_dist, new_dist); err == nil {
stack.old_dist = combined_dist
}
return divideDists(old_dist, new_dist)
case "+":
if combined_dist, err = operateDistsAsSamples(stack.old_dist, new_dist, "+"); err == nil {
stack.old_dist = combined_dist
}
return operateDistsAsSamples(old_dist, new_dist, "+")
case "-":
if combined_dist, err = operateDistsAsSamples(stack.old_dist, new_dist, "-"); err == nil {
stack.old_dist = combined_dist
return operateDistsAsSamples(old_dist, new_dist, "-")
default:
return nil, printAndReturnErr("Can't combine distributions in this way")
}
}
/* Parser and repl */
func parseLineIntoOpAndDist(line string, vars map[string]Dist) (string, Dist, error) {
words := strings.Split(strings.TrimSpace(line), " ")
op := ""
var dist Dist
switch words[0] {
case "*", "/", "+", "-":
op = words[0]
words = words[1:]
default:
op = "*" // later, change the below to
}
parseLineErr := func(err_msg string) (string, Dist, error) {
return "", nil, printAndReturnErr(err_msg)
}
switch len(words) {
case 0:
return parseLineErr("Operator must have operand; can't operate on nothing")
case 1:
var_word, var_word_exists := vars[words[0]]
single_float, err1 := strconv.ParseFloat(words[0], 64) // abstract this away to search for K/M/B/T/etc.
switch {
case var_word_exists:
dist = var_word
case err1 == nil:
dist = Scalar(single_float)
case err1 != nil && !var_word_exists:
return parseLineErr("Trying to operate on a scalar, but scalar is neither a float nor an assigned variable")
}
case 2:
new_low, err1 := strconv.ParseFloat(words[0], 64)
new_high, err2 := strconv.ParseFloat(words[1], 64)
if err1 != nil || err2 != nil {
return parseLineErr("Trying to operate by a distribution, but distribution is not specified as two floats")
}
dist = Lognormal{low: new_low, high: new_high}
case 3:
if words[0] == "beta" || words[0] == "b" {
a, err1 := strconv.ParseFloat(words[1], 64)
b, err2 := strconv.ParseFloat(words[2], 64)
if err1 != nil || err2 != nil {
return parseLineErr("Trying to specify a beta distribution? Try beta 1 2")
}
dist = Beta{a: a, b: b}
} else {
return parseLineErr("Input not understood or not implemented yet")
}
default:
fmt.Println("Can't combine distributions in this way")
return parseLineErr("Input not understood or not implemented yet")
}
return stack
return op, dist, nil
}
/* Combine old dist and new line */
// We want this as a function (rather than just be in main)
// to be able to have parenthesis/recusion, possibly functions
func runRepl(stack Stack, reader *bufio.Reader) Stack {
replForLoop:
for {
new_line, _ := reader.ReadString('\n')
words := strings.Split(strings.TrimSpace(new_line), " ")
switch {
/* Empty line case */
case strings.TrimSpace(new_line) == "":
continue replForLoop
case strings.TrimSpace(new_line) == "": /* Empty line case */
/* Parenthesis */
case len(words) == 2 && (words[0] == "*" || words[0] == "+" || words[0] == "-" || words[0] == "/") && words[1] == "(":
new_stack := runRepl(Stack{old_dist: INIT_DIST, vars: stack.vars}, reader) // to do: think if I want to shadow variables or not (right now, variables persist, since I'm copying the map(.
stack = operateStackWithDist(stack, new_stack.old_dist, words[0])
prettyPrintDist(stack.old_dist)
new_stack := runRepl(Stack{old_dist: INIT_DIST, vars: stack.vars}, reader)
combined_dist, err := operateDists(stack.old_dist, new_stack.old_dist, words[0])
if err == nil {
stack.old_dist = combined_dist
}
case len(words) == 1 && words[0] == ")":
return stack
/* Special operations */
case words[0] == "exit" || words[0] == "e":
os.Exit(0)
case words[0] == "help" || words[0] == "h":
fmt.Println(GENERAL_ERR_MSG)
continue replForLoop
fmt.Println(HELP_MSG)
case words[0] == "debug" || words[0] == "d":
fmt.Printf("Old dist: %v\n", stack.old_dist)
fmt.Printf("Vars: %v\n", stack.vars)
continue replForLoop
fmt.Printf("%v", stack)
case words[0] == "clear" || words[0] == "c" || words[0] == ".":
stack.old_dist = INIT_DIST
fmt.Println()
continue replForLoop
/* Variable assignment */
case words[0] == "=:" && len(words) == 2:
stack.vars[words[1]] = stack.old_dist
fmt.Printf("%s ", words[1])
prettyPrintDist(stack.old_dist)
continue replForLoop
case words[0] == "=." && len(words) == 2:
stack.vars[words[1]] = stack.old_dist
fmt.Printf("%s ", words[1])
prettyPrintDist(stack.old_dist)
stack.old_dist = INIT_DIST
fmt.Println()
continue replForLoop
// fmt.Println()
// continue replForLoop
default:
op, new_dist, err := parseLineIntoOpAndDist(new_line, stack.vars)
if err != nil {
continue replForLoop
}
stack = operateStackWithDist(stack, new_dist, op)
combined_dist, err := operateDists(stack.old_dist, new_dist, op)
if err == nil {
stack.old_dist = combined_dist
}
}
prettyPrintDist(stack.old_dist)
}
}
}
/* Main event loop */
func main() {
reader := bufio.NewReader(os.Stdin)
stack := Stack{old_dist: INIT_DIST, vars: make(map[string]Dist)}
runRepl(stack, reader)

1
pretty/pretty.go
View File

@ -48,5 +48,4 @@ func PrettyPrint2Floats(low float64, high float64) {
PrettyPrintFloat(low)
fmt.Printf(" ")
PrettyPrintFloat(high)
fmt.Printf("\n")
}