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40 lines
693 B
Go
40 lines
693 B
Go
package zxcvbnmath
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import "math"
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/*
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NChoseK http://blog.plover.com/math/choose.html
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I am surprised that I have to define these. . . Maybe i just didn't look hard enough for a lib.
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*/
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func NChoseK(n, k float64) float64 {
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if k > n {
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return 0
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} else if k == 0 {
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return 1
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}
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var r float64 = 1
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for d := float64(1); d <= k; d++ {
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r *= n
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r /= d
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n--
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}
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return r
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}
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// Round a number
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func Round(val float64, roundOn float64, places int) (newVal float64) {
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var round float64
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pow := math.Pow(10, float64(places))
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digit := pow * val
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_, div := math.Modf(digit)
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if div >= roundOn {
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round = math.Ceil(digit)
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} else {
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round = math.Floor(digit)
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}
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newVal = round / pow
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return
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}
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