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// Copyright ©2015 The Gonum 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 distmv
var (
badQuantile = "distmv: quantile not between 0 and 1"
badReceiver = "distmv: input slice is not nil or the correct length"
badSizeMismatch = "distmv: size mismatch"
badZeroDimension = "distmv: zero dimensional input"
nonPosDimension = "distmv: non-positive dimension input"
const logTwoPi = 1.8378770664093454835606594728112352797227949472755668
// useAs gets a slice of size n. If len(x) == n, x is returned, if len(x) == 0
// then a slice is returned of length n.
func reuseAs(x []float64, n int) []float64 {
if len(x) == n {
return x
if len(x) == 0 {
if cap(x) >= n {
return x[:n]
return make([]float64, n)
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