Graphics

Adding Plots to an Existing Graph

You can add plots to an existing graph using the hold command. When you set hold to on, MATLAB does not remove the existing graph; it adds the new data to the current graph, rescaling if the new data falls outside the range of the previous axis limits.

For example, these statements first create a semilogarithmic plot, then add a linear plot.

• semilogx(1:100,'+')
  hold on
  plot(1:3:300,1:100,'--')
  hold off
  

While MATLAB resets the x-axis limits to accommodate the new data, it does not change the scaling from logarithmic to linear.

Specifying the Color and Size of Lines

Plotting Only the Data Points