**polgrid()** draws a polar grid. *rmax* and *rmin* are
the maximum and minimum values of the radial coordinate. If *mode*
is 0, the values of *rmax* and *rmin* are those of the outer-
and innermost circular grid lines expressed in user units [e.g., -20. for
-20 db or -1.5 for 10 exp(-1.5)]. Otherwise *rmin* should be set to
0.0. *larray* is an array of string
labels of size *dim*. The outermost circle and the origin are
not labeled. Therefore, there are *dim*+1 circles. *col* sets
the color for labels. Alternate radial lines go to the origin; therefore,
*ntheta* should be an even number. |