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43 lines
963 B
Go
43 lines
963 B
Go
package math
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import (
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"context"
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"math"
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"github.com/MontFerret/ferret/pkg/runtime/core"
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"github.com/MontFerret/ferret/pkg/runtime/values"
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"github.com/MontFerret/ferret/pkg/runtime/values/types"
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)
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// StandardDeviationPopulation returns the population standard deviation of the values in a given array.
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// @params (Array) - Array of numbers.
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// @returns (Float) - The population standard deviation.
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func StandardDeviationPopulation(_ context.Context, args ...core.Value) (core.Value, error) {
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var err error
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err = core.ValidateArgs(args, 1, 1)
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if err != nil {
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return values.None, err
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}
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err = core.ValidateType(args[0], types.Array)
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if err != nil {
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return values.None, err
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}
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arr := args[0].(*values.Array)
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if arr.Length() == 0 {
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return values.NewFloat(math.NaN()), nil
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}
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vp, err := variance(arr, values.NewInt(0))
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if err != nil {
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return values.NewFloat(math.NaN()), err
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}
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return values.NewFloat(math.Pow(float64(vp), 0.5)), nil
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}
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