MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Pobierz pdf (Strona 301)

Plot Workspace Variables in a GUIDE UI

9-55

• Returns two string variables, if there are two items selected. Otherwise

get_var_names displays an error dialog box stating that you must select two

variables.

Here is the code for get_var_names:

function [var1,var2] = get_var_names(handles)

list_entries = get(handles.listbox1,'String');

index_selected = get(handles.listbox1,'Value');

if length(index_selected) ~= 2

errordlg('You must select two variables',...

'Incorrect Selection','modal')

else

var1 = list_entries{index_selected(1)};

var2 = list_entries{index_selected(2)};

end

Callbacks for the Plotting Buttons

The callbacks for the plotting buttons call get_var_names to get the names of the

variables to plot and then call evalin to execute the plot commands in the base

workspace.

For example, here is the callback for the plot function:

function plot_button_Callback(hObject, eventdata, handles)

[x,y] = get_var_names(handles);

evalin('base',['plot(' x ',' y ')'])

The command to evaluate is created by concatenating the strings and variables, and

looks like this:

try

evalin('base',['semilogx(',x,',',y,')'])

catch ex

errordlg(...

ex.getReport('basic'),'Error generating semilogx plot','modal')

end

The try/catch block handles errors resulting from attempting to graph inappropriate

data. When evaluated, the result of the command is:

plot(x,y)

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