MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual de usuario descargar pdf (Pagina 274)

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101

9 Examples of GUIDE UIs

9-28

Plot Data

The final task for the plot_button_Callback is to generate two plots. This involves:

• Targeting plots to the appropriate axes. For example, this code directs a graph to the

time axes:

plot(handles.time_axes,t,x)

• Providing the appropriate data to the plot function

• Turning on the axes grid, which the plot function automatically turns off

Note: Performing the last step is necessary because many plotting functions (including

plot) clear the axes and reset properties before creating the graph. This means that

you cannot use the Property Inspector to set the XMinorTick, YMinorTick, and grid

properties in this example, because they are reset when the callback executes plot.

In the following code listing, notice how the handles structure provides access to the

handle of the axes, when needed.

Plot_Button Callback

function plot_button_Callback(hObject, eventdata, handles, varargin)

% hObject handle to plot_button (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% Get user input

f1 = str2double(get(handles.f1_input,'String'));

f2 = str2double(get(handles.f2_input,'String'));

t = eval(get(handles.t_input,'String'));

% Calculate data

x = sin(2*pi*f1*t) + sin(2*pi*f2*t);

y = fft(x,512);

m = y.*conj(y)/512;

f = 1000*(0:256)/512;

% Create frequency plot in proper axes

plot(handles.frequency_axes,f,m(1:257))

set(handles.frequency_axes,'XMinorTick','on')

grid on

% Create time plot in proper axes

plot(handles.time_axes,t,x)

set(handles.time_axes,'XMinorTick','on')

grid on

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