Function newTableXYName

plot/plotcore/tablexy.go:63–71

newTableXYName returns a new XY plot view onto the given IndexView of table.Table (makes a copy), from given column name and tensor indexes within each cell. Column indexes are enforced to be valid, with an error message if they are not.

(dt *table.IndexView, xi, xtsrIndex int, ycol string, ytsrIndex int, yrng minmax.Range32)

// from given column name and tensor indexes within each cell.
// Column indexes are enforced to be valid, with an error message if they are not.
func newTableXYName(dt *table.IndexView, xi, xtsrIndex int, ycol string, ytsrIndex int, yrng minmax.Range32) (*tableXY, error) {
	yi, err := dt.Table.ColumnIndexTry(ycol)
	if err != nil {
		log.Println(err)
		return nil, err
	}
	txy := &tableXY{table: dt.Clone(), xColumn: xi, yColumn: yi, xIndex: xtsrIndex, yIndex: ytsrIndex, yRange: yrng}
	return txy, txy.validate()
}

// validate returns error message if column indexes are invalid, else nil
// it also sets column indexes to 0 so nothing crashes.