37 lines
864 B
Go
37 lines
864 B
Go
// Copyright © 2016 Abcum Ltd
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package math
|
|
|
|
import "math/rand"
|
|
|
|
func Sample(vals []float64, take int) []float64 {
|
|
|
|
var out []float64
|
|
|
|
if len(vals) == 0 {
|
|
return nil
|
|
}
|
|
|
|
for k, v := range rand.Perm(len(vals)) {
|
|
if k < take {
|
|
out = append(out, vals[v])
|
|
continue
|
|
}
|
|
break
|
|
}
|
|
|
|
return out
|
|
|
|
}
|