Merge pull request #357 from quantified-uncertainty/hotfix-negative-multiply
Prevent negative standard deviation in symbolic multiplication
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296bc44a0d
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@ -20,6 +20,7 @@ describe("eval on distribution functions", () => {
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})
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describe("unaryMinus", () => {
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testEval("mean(-normal(5,2))", "Ok(-5)")
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testEval("-normal(5,2)", "Ok(Normal(-5,2))")
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})
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describe("to", () => {
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testEval("5 to 2", "Error(Math Error: Low value must be less than high value.)")
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@ -52,7 +52,7 @@ module Normal = {
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switch operation {
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| #Add => Some(#Normal({mean: n1 +. n2.mean, stdev: n2.stdev}))
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| #Subtract => Some(#Normal({mean: n1 -. n2.mean, stdev: n2.stdev}))
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| #Multiply => Some(#Normal({mean: n1 *. n2.mean, stdev: n1 *. n2.stdev}))
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| #Multiply => Some(#Normal({mean: n1 *. n2.mean, stdev: Js.Math.abs_float(n1) *. n2.stdev}))
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| _ => None
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}
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@ -60,8 +60,8 @@ module Normal = {
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switch operation {
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| #Add => Some(#Normal({mean: n1.mean +. n2, stdev: n1.stdev}))
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| #Subtract => Some(#Normal({mean: n1.mean -. n2, stdev: n1.stdev}))
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| #Multiply => Some(#Normal({mean: n1.mean *. n2, stdev: n1.stdev *. n2}))
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| #Divide => Some(#Normal({mean: n1.mean /. n2, stdev: n1.stdev /. n2}))
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| #Multiply => Some(#Normal({mean: n1.mean *. n2, stdev: n1.stdev *. Js.Math.abs_float(n2)}))
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| #Divide => Some(#Normal({mean: n1.mean /. n2, stdev: n1.stdev /. Js.Math.abs_float(n2)}))
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| _ => None
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}
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}
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