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Mechanisms for Managing Data

9-5

The following table summarizes the functions that provide access to

application data. For more detailed information, see the individual function

reference pages.

Creating Application Data in GUIDE

Use the setappdata function to create application data. This example

generates a 35-by-35 matrix of normally distributed random numbers in the

opening function and creates application data

mydata to manage it.

function mygui_OpeningFcn(hObject, eventdata, handles, varargin)

matrices.rand_35 = randn(35);

setappdata(hObject,'mydata',matrices);

Because this code appears in the opening function, hObject is the handle of the

GUI figure, and the code associates

mydata with the figure.

Adding Fields to an Application Data Structure in GUIDE

Application data is usually defined as a structure to enable you to add fields as

necessary. In this example, a push button adds a field to the application data

structure

mydata created in the previous topic.

Functions for Managing Application Data

Function Purpose

setappdata

Specify named application data for an object. The object

does not have to be a figure. You can specify more than

one named application data for an object. However,

each name must be unique for that object and can be

associated with only one value, usually a structure.

getappdata

Retrieve named application data. To retrieve named

application data, you must know the name associated

with the application data and the handle of the object

with which it is associated.

isappdata

True if the named application data exists.

rmappdata

Remove the named application data.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador Página 217