Plotting Symbols

The simplest form of plotting is to draw symbols (termed markers) at a set of points. This is performed by astMarkastMark, which is supplied with a set of physical coordinates at which to place the markers:

#include "ast.h"
#define NCOORD 2
#define NMARK 10
double in[ NCOORD ][ NMARK ];
int type;

...

astMark( plot, NMARK, NCOORD, NMARK, in, type );

Here, NMARK specifies how many markers to plot and NCOORD specifies how many coordinates are being supplied for each point.32 The array ``in'' supplies the coordinates and the integer ``type'' specifies which type of marker to plot.