Method YError

plot/plotcore/tablexy.go:234–253

YError returns error bars, implementing [plots.YErrorer] interface.

(row int)

// YError returns error bars, implementing [plots.YErrorer] interface.
func (txy *tableXY) YError(row int) (float32, float32) {
	if txy.table == nil || txy.table.Table == nil || row >= txy.table.Len() {
		return 0, 0
	}
	trow := txy.table.Indexes[row] // true table row
	ec := txy.table.Table.Columns[txy.errColumn]
	eval := float32(0.0)
	switch {
	case ec.IsString():
		eval = float32(row)
	case ec.NumDims() > 1:
		_, sz := ec.RowCellSize()
		if txy.yIndex < sz && txy.yIndex >= 0 {
			eval = float32(ec.FloatRowCell(trow, txy.yIndex))
		}
	default:
		eval = float32(ec.Float1D(trow))
	}
	return -eval, eval
}