54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
// Copyright © 2016 SurrealDB 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 Median(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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l := len(vals)
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switch {
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case l%2 == 0:
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sort := Sort(vals)
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return Mean(sort[l/2-1 : l/2+1])
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default:
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sort := Sort(vals)
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return float64(sort[l/2])
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}
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}
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func MedianAbsoluteDeviation(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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dups := Copy(vals)
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m := Median(dups)
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for k, v := range dups {
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dups[k] = math.Abs(v - m)
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}
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return Median(dups)
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}
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