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