Scattered points

Syntax: | `CONTOUR x y v nctr { min { incr }} CONTOUR\COLOURS colr x y v nctr { min { incr }} CONTOUR\SPECIFIC x y v lvls CONTOUR\SPECIFIC\COLOURS colr x y v lvls`
Qualifiers: | `\SPECIFIC, \POLAR, \LEGEND, \COLOURS, \PARTIAL, \RESET, \BORDER, \AXES, \COORDINATES`
Defaults: | `\-SPECIFIC, \-POLAR, \-LEGEND, \-COLOURS, \-RESET, \BORDER, \AXES, \-COORDINATES`

If `z` is a vector, the vectors `x` and `y` are assumed to represent a scattered set of coordinates, where `z[i]` is the altitude corresponding to the coordinate location `(x[i],y[i])`. The vectors `x` and `y` must be entered if `z` is a vector.

Contours are computed by successive solution of quintic polynomial equations. The irregularly distributed data points are organized as triangles and the partial derivatives at each point are estimated from the function values of the neighboring points.

Areas and volumes cannot be calculated from scattered data.

Axes
Matrix data