MATLAB: Plotting in gui

axescallbackguiguihandlesplot

Hi All,

I am trying to desing a gui interface to interactively render plots. So I have a 2×3 figure pallet. All six have the tags axes_row11,axes_row12 …and so on. I am trying to access these axes objects (from within a callback) by the following commands:

*********************************

mydata = guihandles(hObject);
axes(mydata.axes_row11);plot(1,1)
axes(mydata.axes_row12);plot(1,2);

plot(mydata.axes_row11,1,1);
plot(mydata.axes_row12,1,2);

***************************************

Question: During the 2nd call to the 'Callback' I found that both axes_row11 and axes_row12 had been deleted and cannot be accessed anymore. Initating the commands 'plot'/'axes' is somehow modifying mydata by deleting certain handles. how do i solve this problem ?

please help

thanks,

rishabh

Best Answer

thanks you all for the suggestions. However, none worked. In the end I figured that somehow the tag field was being erased by invoking the 'plot'. So I simply did the following:

************** plot(handles.axes_row11,1,1); set(handles.axes_row11,'Tag','axes_row11') ************************* so that next time I invoked the callback, the tag was still there. thanks again

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MATLAB: Does the output from GUIHANDLES change after I plot to the GUI in MATLAB

This behavior is the result of a combination of the side effects of PLOT, the axes' "NextPlot" property, and the use of GUIHANDLES.

PLOT makes a call to the NEWPLOT function to determine which axes to use. Also, depending on the axes' "NextPlot" property, some of that axes' properties may be set to default values. If the property has the value "Replace", it will reset all of the axes' properties and delete all of the children of the axes. This includes the axes' "Tag" property, set to an empty string. If the "NextPlot" property is set to "ReplaceChildren", then NEWPLOT will only delete the axes' children and will not change the axes' other properties.

GUIHANDLES creates a structure containing the handles for all figure objects having a non-empty "Tag" value (thus having a valid fieldname for a structure). Since the axes' Tag will be an empty string after plotting, it will not be included in the handles structure that is output by GUIHANDLES.

There are two ways around this problem:

1) Do not use GUIHANDLES to get the "handles" structure. If you are using GUIDE and are working in a GUIDE-generated callback function, the "handles" structure will already exist as an input to the function. Also, GUIHANDLES is only intended for use in initializing the GUI. After the GUI is initialized, use the GUIDATA function to get the "handles" structure since the structure may be modified.

2) Set the axes' NextPlot property to 'replacechildren'. This way, the axes' Tag property won't be changed when PLOT calls NEWPLOT.

MATLAB: Hi guys, i want to plot in GUI, i’ve tried this code.

Get rid of the calls to set and just do this:

handles.ans1 = (-(handles.mydata.b) + dis) /(2*(handles.mydata.a));
handles.ans2 = (-(handles.mydata.b) - dis) /(2*(handles.mydata.a))

In the second callback do this instead:

x=0:(length(handles.ans1) - 1);
plot(x,handles.ans1, handles.axes1);
grid on;
hold on;
x=0:(length(handles.ans2) - 1);
plot(x,handles.ans2, handles.axes2);

If it still doesn't work, then find a call to guidata() somewhere in your code and copy it to the last line of the callback that assigns handles.ans1 and handles.ans2.

Best Answer

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MATLAB: Does the output from GUIHANDLES change after I plot to the GUI in MATLAB

MATLAB: Hi guys, i want to plot in GUI, i’ve tried this code.

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