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tic toc in a GUI

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tony karamp
tony karamp on 10 Apr 2013
Commented: Walter Roberson on 17 Aug 2015
hello all,
I have created a GUI, using GUIDE. I have added pushbuttons which perform a task. The start button, plots a graph and plays a wavefile that I have assigned to it. in the start button I have added as well a 'tic'.
on the other side of the GUI is have another button, the save button. The function of that button is to save to a vector the exact time that I push the button. The code that I have used saves only the last instance, while I want to be able to see all of the elements of that vector.
handles.counter.push(handles.count + 1)
handles.sfront(size(handles.counter)) = toc
Is there a way to save all of the instances to the sfront vector?
Thank you in advance!


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Accepted Answer

Jan on 11 Apr 2013
You want to save the time when the button is pressed. This is neither tic/toc not cputime, but clock or now.
To accumulate the time stampes, you have to store them cummulatively, e.g.:
During the creation of the GUI:
handles.counter.push = [];
In the callback of the button:
handles = guidata(hObject); % Get the newest version
handles.counter.push(end + 1) = now;
% Alternatively the DATEVEC format:
% handles.counter.push(end + 1, :) = clock;
guidata(hObject, handles); % Save the updated struct
And finally in the function for saving, handles.counter.push contains all times the button was pressed.


tony karamp
tony karamp on 11 Apr 2013
Thank you all for your time, but actually I found what was missing!
handles.counter.push(handles.count + 1)
handles.sfront(size(handles.counter)) = toc;
guidata(hObject, handles);
Now it works perfectly!
mzakaria on 17 Aug 2015
How did you initialize sfront? I'm trying to do the same thing but I keep getting the error that the variable is unknown.
Walter Roberson
Walter Roberson on 17 Aug 2015
With that code, even if the variable was undefined beforehand, the code would define it. However, it should be
handles.sfront(length(handles.counter)) = toc;
as size() would return a vector with at least two elements and when used to index in the form shown would result in two elements of handles.sfront being set to the result of toc(). Better yet would probably be just
handles.count = handles.count + 1;
handles.sfront(handles.count) = toc;
guidata(hObject, handles);
and before that you would have initialized with
handles.count = 0;
handles.sfront = [];
guidata(hObject, handles);

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More Answers (1)

Babak on 10 Apr 2013
tic toc gives you the total elapsed amount of time. There is no such meaning of all the instances... you cannot save time instances..


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Babak on 10 Apr 2013
Time is a continuous variable. I suppose you need to get the time at some instances that you wish. As soon as you command tic, it sstarts measuring the time and when you say toc it gives you the elapsed time from the last tic. If you say toc again it gives you another elapsed time which is longer than the last one. so you can just simply say tic toc toc toc toc and get times at instances you wish. Try it in the command window. I would use it this way and save the toc values.
tony karamp
tony karamp on 10 Apr 2013
Could I add an action listener, such as in java, with a counter? the value of the counter indicates the position in the vector. How about then?
Babak on 10 Apr 2013
I don't know. I suggest you create another question and ask your "new" question from public.

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