Controls the number of major ticks on the x-axis of a 2-D plot.
&myPlot (struct pointer) – A
num_tics (Scalar) – the number of major ticks to place on the x-axis.
// Create some data to plot x = seqa(-3, 0.1, 61); y = x.^3 + rndn(rows(x), 1); // Plot the data plotXY(x, y);
will produce a graph that looks similar to the one above, with 5 major tick marks on the x-axis. If we use 8 tick marks, there will be one major tick for every integer on the x-axis. We can make that change like this:
// Declare and initialize plotControl structure struct plotControl myPlot; myPlot = plotGetDefaults("xy"); // Set the x-axis to have 8 tick marks plotSetXTicCount(&myPlot, 8); // Plot the data, using the plotControl structure plotXY(myPlot, x, y);
plotSetXTicInterval() does not provide complete control over the
x-axis ticks. If the number of x-ticks requested would cause an odd x-tick
interval, GAUSS will create a number of ticks that will provide more even
spacing. For instance, in the example above, 8 ticks gave a space between
ticks of 1. If we chose 9 ticks, the spacing between ticks would be 0.889.
In that case, GAUSS would instead draw 8 ticks for a more even
For more control over the x-axis of time series plots, use
This function sets an attribute in a
plotControl structure. It does not
affect an existing graph, or a new graph drawn using the default
settings that are accessible from the
The axis updated by this function is determined by the value previously specified by
plotSetActiveX(). The accepted values are
Future calls to
plotSetActiveX() will not retroactively change the values of a previously modified axis.