DPUSER incorporates the complete PGPLOT
package. All modules of this package are realized as procedures (see
list of available PGPLOT procedures). The PGPLOT documentation provided
here is a verbatim copy of the online documentation of PGPLOT.
DPUSER uses a global variable
plotdevice to control graphics
output. Available devices depend on your installation of PGPLOT. The default
graphics device on UNIX workstations is "/xserve". This can be
changed by assigning a new string value to the variable. A typical use
of PGPLOT looks like this:
plotdevice = "/tmp/test.eps/ps" // Write ps output to /tmp/test.epsSince plotting a x-y graph is, amongs others, a very common task, DPUSER provides several convenience procedures to do things like this: plot, contour, surface, and shade. The above example using the plot command looks like this:
x = [-3600:3600]/10 // create x-axes
y = sin(x, /deg) // create sine function (y-axes)
pgopen plotdevice // Start plotting
pgenv -360, 360, -1, 1, 0, 0 // draw labeled frame
pglab "angle", "sine", "test plot" // annotate plot
pgline 7201, x, y // draw the sine function
pgend // end plotting
plotdevice = "/xserve" // reset graph output to X
plotdevice = "/tmp/test.eps/ps" // Write ps output to /tmp/test.epsThis can be done even shorter:
x = [-3600:3600]/10 // create x-axes
y = sin(x, /deg) // create sine function (y-axes)
plot x, y, xtitle="angle", ytitle="sine", title="test plot"
// do the plot
plotdevice = "/xserve" // reset graph output to X
plot sin([-3600:3600]/10)will plot a sine function without any annotation to the current plot device, overriding any previous plot. A very simple contour plot can also be done:
contour gauss(129,129,30,50,30), [1:9]*10will do a contour plot of an elliptical gaussian with contour levels 10%, 20%, ..., 90%.