Getting Started

Adding Plots to an Existing Graph

The hold command enables you to add plots to an existing graph. When you type

hold on

MATLAB does not replace the existing graph when you issue another plotting command; it adds the new data to the current graph, rescaling the axes if necessary.

For example, these statements first create a contour plot of the peaks function, then superimpose a pseudocolor plot of the same function.

[x,y,z] = peaks;
contour(x,y,z,20,'k')
hold on
pcolor(x,y,z)
shading interp
hold off

The hold on command causes the pcolor plot to be combined with the contour plot in one figure.

Imaginary and Complex Data

Figure Windows