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Guide handing objects to functions

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Robert Worm
Robert Worm on 17 Aug 2018
Commented: Robert Worm on 17 Aug 2018
Using Guide I have two radiobuttons. When pushing one the other has to be unchecked. So far this is my solution:
function distButton_Callback(hObject, eventdata, handles)
checkThis = get(handles.distButton, 'Value');
checkThat = get(handles.fftButton, 'Value');
if checkThis == checkThat
set(handles.fftButton, 'Value', ~checkThis);
end
Since there are four button pairs a function would save a couple of lines.
Calling the function:
checkThis('distButton', 'fftButton', handles);
However combining handles. with a string does not seem to convert this to 'distButton'
> Reference to non-existent field 'this'.
function checkThis(this, that, handles)
checkThis = get(handles.this, 'Value');
checkThat = get(handles.that, 'Value');
if checkThis == checkThat
set(handles.that, 'Value', ~checkThis);
end
It's probably a simple matter of syntax..
  2 Comments
Adam
Adam on 17 Aug 2018
Why are you not just placing the radio buttons inside a uibuttongroup which does the mutual exclusivity for you?
Robert Worm
Robert Worm on 17 Aug 2018
Since this is my first time working with guide, I was simply not aware of that. Thanks for the advice.

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Accepted Answer

ES
ES on 17 Aug 2018
function checkThis(this, that, handles)
checkThis = get(eval(['handles.', this]), 'Value');
checkThat = get(eval(['handles.', that]), 'Value');
if checkThis == checkThat
set(eval(['handles.', that]), 'Value', ~checkThis);
end
  3 Comments
Stephen23
Stephen23 on 17 Aug 2018
Edited: Stephen23 on 17 Aug 2018
Do NOT follow this answer! There is absolutely no point in using ugly eval like that, unless you want to force yourself into writing slow, complex, buggy, hard-to-debug code.
It is so easy to write simpler and much more efficient code:
function checkThis(this, that, handles)
checkThis = get(handles.(this),'Value');
checkThat = get(handles.(that),'Value');
if checkThis==checkThat
set(handles.(that),'Value',~checkThis);
end
And, as Adam already wrote, a uibuttongroup would be even simpler.
Robert Worm
Robert Worm on 17 Aug 2018
Much appreciated. I will take this into account.

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