Scattered points
Syntax: |
CONTOUR x y v nctr { min { incr }}
|
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.