Creating Graphical User Interfaces

Accessing Workspace Variables from a List Box

This GUI uses a list box to display workspace variables, which the user can then plot.

Techniques Used in This Example

This example demonstrates how to:

• Populate the list box with the variable names that exist in the base workspace.
• Display the list box with no items initially selected.
• Enable multiple item selection in the list box.
• Update the list items when the user press a button.
• Evaluate the plotting commands in the base workspace.

The following figure illustrates the layout.

Note that the list box callback is not used in this program because the plotting actions are initiated by push buttons. In this situation you must do one of the following:

• Leave the empty list box callback in the GUI M-file.
• Delete the string assigned to the list box Callback property.

View the Layout and GUI M-File

If you are reading this in the MATLAB Help browser, you can click the following links to display the GUIDE Layout Editor and the MATLAB Editor with a completed version of this example. This enables you to see the values of all component properties and to understand how the components are assembled to create the GUI. You can also see a complete listing of the code that is discussed in the following sections.

Note    The following links execute MATLAB commands and are designed to work within the MATLAB Help browser. If you are reading this online or in PDF, you should go to the corresponding section in the MATLAB Help Browser to use the links.

• Click here to display this GUI in the Layout Editor.
• Click here to display the GUI M-file in the editor.

Loading the List Box

Reading Workspace Variables