MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guida Utente Scaricare il pdf (Pagina 439)

100

101

Access Workspace Variables from a List Box (GUIDE)

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

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

if length(in dex_ selected) ~= 2

errordlg('You m ust select two var iabl es',...

'Incorrect S elec tion','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_b utto n_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 pl ot','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)

The other two plotting buttons w ork in the same way, resulting in

semilogx(x,y) and semilogy(x,y).

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guida Utente Pagina 439

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