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math/rand: improve NewZipf documentation

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Change-Id: I78f0f9ac33db153c4a0d7f9866da20ebcd3d3639
Reviewed-on: https://go-review.googlesource.com/11872
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-07-03 11:11:42 -07:00
parent 40a1516a09
commit 71832ff489
1 changed files with 4 additions and 2 deletions
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6
src/math/rand/zipf.go
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@ -32,8 +32,10 @@ func (z *Zipf) hinv(x float64) float64 {
return math.Exp(z.oneminusQinv*math.Log(z.oneminusQ*x)) - z.v
}
// NewZipf returns a Zipf generating variates p(k) on [0, imax]
// proportional to (v+k)**(-s) where s>1 and k>=0, and v>=1.
// NewZipf returns a Zipf variate generator.
// The generator generates values k ∈ [0, imax]
// such that P(k) is proportional to (v + k) ** (-s).
// Requirements: s > 1 and v >= 1.
func NewZipf(r *Rand, s float64, v float64, imax uint64) *Zipf {
z := new(Zipf)
if s <= 1.0 || v < 1 {