wait bar in MATLAB gui in nested FOR loop
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I have to show a progress bar in matlab guide that appears while running FOR loop and shows progress for each iteration. Moreover, the user should not be able to close it until the calculation stops, so as to prevent the user from making any changes. Example code is as follows
MBTs = minMBT:stepMBT:maxMBT;
MATs = minMAT:stepMAT:maxMAT;
i=1;
for MAT = MATs
j = 1;
for MBT = MBTs
%some calculations
j = j + 1;
end
i = i + 1;
end
采纳的回答
MBTs = minMBT:stepMBT:maxMBT;
MATs = minMAT:stepMAT:maxMAT;
n = length(MATs) * length(MBTs);
c = 0;
H = waitbar(0, 'Please wait...');
for i1 = 1:length(MATs)
MAT = MATs(i1);
for i2 = 1:length(MBTs)
MBT = MBTs(i2);
%some calculations
% Update the waitar:
if ~ishghandle(H)
error('User closed waitbar.');
end
c = c + 1;
waitbar(c / n, H, sprintf('%d of %d', c, n));
end
end
It would be brute to forbid, that the user closes the waitbar. Imagine that the loop runs for 2 hours for unknown reasons. Do you really block a premature stopping? User hate such restrictions for good reasons.
9 个评论
Aash
2018-5-11
Aash
2018-5-11
What does "disable the cancel function" mean? Which cancel function? If you do not specify the 'CreateCancelBtn' property of waitbar, there is no Cancel button.
H = waitbar(0, 'Please wait...');
WindowAPI(H, 'Button', 'off');
I've showed in my code how to catch a closed waitbar window. You should be able to start a proper cleanup instead of the error.
To change the cursor:
H = waitbar(0, 'Please wait...');
set(H, 'Pointer', 'watch');
...
set(H, 'Pointer', 'arrow');
Aash
2018-5-12
Jan
2018-5-12
What is "the entire GUI"? Matlab's command window or the operating system? You can set the cursor in each window by using its handle. So if you have e.g. a figure created by GUIDE, use its handle for the above commands.
Aash
2018-5-12
Jan
2018-5-12
So you mean the window called "Untitled"? It seems to be created by GUIDE. And I guess, that the waitbar is opened inside one of the callbacks? Then insert there:
FigH = ancestor(hObject, 'figure');
set(FigH, 'Pointer', 'watch');
...
set(FigH, 'Pointer', 'arrow');
You have the figure handle inside the struct handles also, but I'm not sure, how it is called. You can check this by your own: Set a breakpoint in the code and display the contents of the handles struct.
Aash
2018-5-12
Jan
2018-5-12
You are welcome, Aash.
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