Printable Plot...
In the following example, we first describe how the Printable Plot
option works, and then show how it can be used to superimpose
eigenvalues and pseudospectra onto an existing plot. The matrix we use
is the Grcar matrix of dimension 100 (available through the Demos menu), and we begin with EigTool as
follows:
Selecting Printable Plot and clicking on the OK button (without entering any text) leaves us with the following figure:
If instead of just removing EigTool's buttons we want to add the EigTool plot to another figure, we simply enter the number of the figure (in this case 2) into the text box when prompted by Printable Plot. Note that we must first ensure that hold on has been set, or the figure contents will be overwritten. The figure below contains the spectrum of the corresponding infinite dimensional Grcar matrix, the entire grey region:
Here is the output produced by EigTool when the pseudospectra are superimposed on top of it.:
Notice how the size and axes for the figure are determined by the EigTool plot, not those that were already being used for the figure.
EigTool home page.