65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
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// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package math
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import "math"
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func Mean(vals []float64) float64 {
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if len(vals) == 0 {
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return math.NaN()
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}
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return Sum(vals) / float64(len(vals))
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}
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func RollingMean(cnt int64, sum float64) float64 {
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return sum / float64(cnt)
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}
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func GeometricMean(vals []float64) float64 {
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if len(vals) == 0 {
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return math.NaN()
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}
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return math.Pow(Product(vals), 1/float64(len(vals)))
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}
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func HarmonicMean(vals []float64) float64 {
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var out float64
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if len(vals) == 0 {
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return math.NaN()
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}
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for _, v := range vals {
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if v < 0 {
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return math.NaN()
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} else if v == 0 {
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return math.NaN()
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}
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out += (1 / v)
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}
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return float64(len(vals)) / out
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}
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