Function newFiveStat

plotter/boxplot.go:134–177

(w vg.Length, loc float64, values Valuer)

}

func newFiveStat(w vg.Length, loc float64, values Valuer) (fiveStatPlot, error) {
	var b fiveStatPlot
	b.Location = loc

	var err error
	if b.Values, err = CopyValues(values); err != nil {
		return fiveStatPlot{}, err
	}

	sorted := make(Values, len(b.Values))
	copy(sorted, b.Values)
	sort.Float64s(sorted)

	if len(sorted) == 1 {
		b.Median = sorted[0]
		b.Quartile1 = sorted[0]
		b.Quartile3 = sorted[0]
	} else {
		b.Median = median(sorted)
		b.Quartile1 = median(sorted[:len(sorted)/2])
		b.Quartile3 = median(sorted[len(sorted)/2:])
	}
	b.Min = sorted[0]
	b.Max = sorted[len(sorted)-1]

	low := b.Quartile1 - 1.5*(b.Quartile3-b.Quartile1)
	high := b.Quartile3 + 1.5*(b.Quartile3-b.Quartile1)
	b.AdjLow = math.Inf(1)
	b.AdjHigh = math.Inf(-1)
	for i, v := range b.Values {
		if v > high || v < low {
			b.Outside = append(b.Outside, i)
			continue
		}
		if v < b.AdjLow {
			b.AdjLow = v
		}
		if v > b.AdjHigh {
			b.AdjHigh = v
		}
	}

	return b, nil
}

// median returns the median value from a
// sorted Values.