route/vendor/github.com/aclements/go-moremath/stats/linearhist.go

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2017-10-06 15:29:20 +00:00
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package stats
// LinearHist is a Histogram with uniformly-sized bins.
type LinearHist struct {
min, max, delta float64
low, high uint
bins []uint
}
// NewLinearHist returns an empty histogram with nbins uniformly-sized
// bins spanning [min, max].
func NewLinearHist(min, max float64, nbins int) *LinearHist {
delta := float64(nbins) / (max - min)
return &LinearHist{min, max, delta, 0, 0, make([]uint, nbins)}
}
func (h *LinearHist) bin(x float64) int {
return int(h.delta * (x - h.min))
}
func (h *LinearHist) Add(x float64) {
bin := h.bin(x)
if bin < 0 {
h.low++
} else if bin >= len(h.bins) {
h.high++
} else {
h.bins[bin]++
}
}
func (h *LinearHist) Counts() (uint, []uint, uint) {
return h.low, h.bins, h.high
}
func (h *LinearHist) BinToValue(bin float64) float64 {
return h.min + bin*h.delta
}