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25 lines
592 B
Go
25 lines
592 B
Go
package stats
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import "math"
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// Median gets the median number in a slice of numbers
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func Median(input Float64Data) (median float64, err error) {
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// Start by sorting a copy of the slice
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c := sortedCopy(input)
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// No math is needed if there are no numbers
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// For even numbers we add the two middle numbers
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// and divide by two using the mean function above
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// For odd numbers we just use the middle number
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l := len(c)
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if l == 0 {
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return math.NaN(), EmptyInput
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} else if l%2 == 0 {
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median, _ = Mean(c[l/2-1 : l/2+1])
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} else {
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median = float64(c[l/2])
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}
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return median, nil
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}
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