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From: Boris on 18 Jun 2010 13:09
Hi,
I used to display images using "imshow" within a classic for loop. I switched to a "parfor" loop to gain computation time, but now everything works except for the image display and I get the error message:

??? Error using ==> parallel_function at 598
Error in ==> imshow at 191
IMSHOW requires Java to run.

To me it seems that all the workers of the matlabpool are not able to run java and use "imshow", but I really couldn't find a way to fix that. I tried some random command using "pctRunOnAll" but nothing worked at all.
May be the problem comes from something else. I've tried to google hundreds of keyword combinations but weirdly, it seems that I am the only one having this issue!

I really don't know at that point so help would be greatly appreciated!! I'm using Matlab R2009b on windows (Vista).

Boris
From: Walter Roberson on 18 Jun 2010 13:43
Boris wrote:

> I used to display images using "imshow" within a classic for loop. I
> switched to a "parfor" loop to gain computation time, but now everything
> works except for the image display and I get the error message:
>
> ??? Error using ==> parallel_function at 598
> Error in ==> imshow at 191
> IMSHOW requires Java to run.
>
> To me it seems that all the workers of the matlabpool are not able to
> run java and use "imshow", but I really couldn't find a way to fix that.

You cannot. All of the graphics must be done from the single original thread.
If you calculate different matrices that have to be displayed then you will
have to find a way to have the original thread display them, such as storing
them and not displaying them until the end of the parfor.
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