How to improve speed when printing multiple images inside a for loop

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Mario A
Mario A 2018-2-1
回答： Rik 2018-2-2
My code generates a figure on each iteration of a for loop, which is printed to a png file each time. Is there a way to speed up this process by letting Matlab continue with the loop while the printing is ongoing? (like a fork-join kind of flow). Any help will be welcome. Example code:
for k=1:10
aux = randn(1e3);
fh = figure('visible','off'); imagesc(aux);
print(fh,'-dpng','-r0','./temp.png'); close(fh)
end
  2 个评论
Rik
Rik 2018-2-1
You are overwriting the image on each loop iteration. And have you tried parfor?
Mario A
Mario A 2018-2-1
The actual code within the for loop (not the example I wrote above) is not compatible with parfor (neither it overwrites the image each time).

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采纳的回答

Mario A
Mario A 2018-2-1
I just found a solution form the parallel computing toolbox, which is the use of parfeval function. This function allows an asynchronous running of another function. The original example is optimized by writing
for k=1:10
aux = randn(1e3);
fh = figure('visible','off'); imagesc(aux);
parfeval(@print,0,fh,'-dpng','-r0','./temp.png'); close(fh)
end

更多回答（1 个）

Rik
Rik 2018-2-2
It is also possible print is inherently slower than it could be, in which case the screencapture FEX submission by Yair Altman might result in a speed increase. You can even use that parfeval in combination with this.

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