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package main
import (
"log"
"reflect"
"github.com/sgreben/jp/pkg/data"
"github.com/sgreben/jp/pkg/draw"
"github.com/sgreben/jp/pkg/plot"
)
func histogramData(xv []reflect.Value, nbins uint) (groups []string, counts []float64) {
var x []float64
for i := range xv {
if xv[i].IsValid() && xv[i].CanInterface() {
xvi, ok := xv[i].Interface().(float64)
if ok {
x = append(x, xvi)
}
}
}
if len(x) == 0 {
log.Fatal("no valid x values given")
}
bins := data.NewBins(x)
bins.Number = int(nbins)
if nbins == 0 {
bins.ChooseSturges()
}
hist := data.Histogram(x, bins)
groups = make([]string, len(hist))
counts = make([]float64, len(hist))
for i, b := range hist {
groups[i] = b.String()
counts[i] = float64(b.Count)
}
return
}
func histogram(xv []reflect.Value, c draw.Canvas, nbins uint) string {
groups, counts := histogramData(xv, nbins)
chart := plot.NewBarChart(c)
chart.BarPaddingX = 0
data := new(data.Table)
for _, g := range groups {
data.AddColumn(g)
}
data.AddRow(counts...)
return chart.Draw(data)
}
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