XValue

xvalue($p[ref])

Finds the x value of a bivariate data point. It is normally used with data parameters.

For example if you have created the following data parameter.

$b=data((11,12)(15,19)(21,28)(13.2,19.4),(8,16))

You can access the x value of one of the data points.

xvalue($b[3])  will return 21