Controls the number of major ticks on the y-axis of a 2-D plot.
&myPlot (struct pointer) – A
num_ticks (scalar) – the number of major ticks to place on the y-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 y-axis. If we use 11 tick marks, there will be one major tick for 0.2 on the y-axis. We can make that change like this:
// Declare and initialize plotControl structure struct plotControl myPlot; myPlot = plotGetDefaults("xy"); // Set the y-axis to have 11 tick marks plotSetYTicCount(&myPlot, 11); // Plot the data, using the plotControl structure plotXY(myPlot, x, y);
plotSetYTicCount() does not provide complete control over the
y-axis ticks. If the number of y-ticks requested would cause an odd tick
interval, GAUSS will create a number of ticks that will provide more even
spacing. For instance, in the example above, 11 ticks gave a space
between ticks of 0.2. If we chose 10 ticks, the spacing between ticks would
be 0.222. In that case, GAUSS would instead draw 10 ticks for a more even
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
plotSetActiveY(). The accepted values are
Future calls to
plotSetActiveY() will not retroactively change the values of a previously modified axis.