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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 gonum
import (
"sort"
"gonum.org/v1/gonum/lapack"
)
// Dlasrt sorts the numbers in the input slice d. If s == lapack.SortIncreasing,
// the elements are sorted in increasing order. If s == lapack.SortDecreasing,
// the elements are sorted in decreasing order. For other values of s Dlasrt
// will panic.
//
// Dlasrt is an internal routine. It is exported for testing purposes.
func (impl Implementation) Dlasrt(s lapack.Sort, n int, d []float64) {
switch {
case n < 0:
panic(nLT0)
case len(d) < n:
panic(shortD)
}
d = d[:n]
switch s {
default:
panic(badSort)
case lapack.SortIncreasing:
sort.Float64s(d)
case lapack.SortDecreasing:
sort.Sort(sort.Reverse(sort.Float64Slice(d)))
}
}