Add a waitbar to a function execution

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Mario
Mario 2017-8-24
评论： Adam 2017-8-25
Hi,
I wrote a function that uses a 3D stack of images as an input, and processes them. As a result of it, a new 3D matrix is created.
I am strugling to add a proper waitbar to this, since it can take from a few seconds to several minutes to complete this task inside this function (depending on the size of the input 3D matrix of images).
I tried several different solutions, but did not succeed.
My input is a stack of 3D images called QQ(MxNxP)
h = waitbar(0,'Please wait...');
steps=size(QQ, 3); %%to extract the number of images inside 3D matrix
for step = 1:steps
A=myFunction(QQ) %%my function goes here, not sure if I need to add something like A(:,:,step)=myFunction(QQ(:,:,step))
waitbar(step / steps)
end
close(h)
How can I properly define the waitbar in order to track execution time of my function?
Thanks!
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Samuel Vergara
Samuel Vergara 2017-8-24
Maybe wour waitbar is not updating correctly. Add just after waitbar(step / steps):
updatenow
Samuel Vergara
Samuel Vergara 2017-8-24
Also, about: %%my function goes here, not sure if I need to add something like A(:,:,step)=myFunction(QQ(:,:,step)) As your code is written, you just replace the value of A by the same value "steps" times.

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回答（1 个）

Stalin Samuel
Stalin Samuel 2017-8-24
编辑：Stalin Samuel 2017-8-24
I have not found any error in the given code. I tested (Matlab 2017a) the code and wait bar working fine.Instead of your function ( myFunction(QQ) ) i used some delay.Below is the tested code
h = waitbar(0,'Please wait...');
steps=30; %%to extract the number of images inside 3D matrix
for step = 1:steps
pause(0.2) %%removed yuur function
A(:,:,step)=myFunction(QQ(:,:,step))
waitbar(step / steps)
end
close(h)
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Mario
Mario 2017-8-25
The strange thing about it is, for example if my image stack contains 10 images, the waitbar runs the function 10 times(each time incrementing the slider value by 1/10).
In other words, it is making it run multiple times, depending on the total number of images in a 3D stack.
Adam
Adam 2017-8-25
You'd need to post more code. The waitbar doesn't cause anything to happen other than the waitbar to update. Anything else is in the rest of your code.

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