Saving contour levels and coordinates
The contour levels are automatically stored in a vector named
CCONT. If the
\COORDINATES qualifier is used, the
x and y coordinates of each contour level are stored in
matrices named XCNT and
YCNT. The number of points stored
for each level is the first element of each column. For example,
XCNT[1,nc] (=n1) is the number of
points making up contour number nc, while
XCNT[2:n1+1,nc] and
YCNT[2:n1+1,nc] would contain the
x and y coordinates of the ncth contour
level. These vectors are then available to the user for plotting and/or
manipulation. Each time the CONTOUR
command is entered, these vectors are emptied and replaced, so if you wish
to keep them, they should be renamed or copied into other vectors.