64 lines
1.2 KiB
Go
64 lines
1.2 KiB
Go
// Copyright © 2016 SurrealDB 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"
|
|
|
|
func Mean(vals []float64) float64 {
|
|
|
|
if len(vals) == 0 {
|
|
return math.NaN()
|
|
}
|
|
|
|
return Sum(vals) / float64(len(vals))
|
|
|
|
}
|
|
|
|
func RollingMean(cnt int64, sum float64) float64 {
|
|
|
|
return sum / float64(cnt)
|
|
|
|
}
|
|
|
|
func GeometricMean(vals []float64) float64 {
|
|
|
|
if len(vals) == 0 {
|
|
return math.NaN()
|
|
}
|
|
|
|
return math.Pow(Product(vals), 1/float64(len(vals)))
|
|
|
|
}
|
|
|
|
func HarmonicMean(vals []float64) float64 {
|
|
|
|
var out float64
|
|
|
|
if len(vals) == 0 {
|
|
return math.NaN()
|
|
}
|
|
|
|
for _, v := range vals {
|
|
if v < 0 {
|
|
return math.NaN()
|
|
} else if v == 0 {
|
|
return math.NaN()
|
|
}
|
|
out += (1 / v)
|
|
}
|
|
|
|
return float64(len(vals)) / out
|
|
|
|
}
|