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From: Fahim Chandurwala on 18 Jul 2010 20:44
Greetings:
I am trying to convert a normal for loop into a parfor loop. The problem I have is that two of the global variables that are declared outside the parfor loop are, however, set in the parfor loop. Is there a way around this problem?
How is it that global variable can be set in for loop and not in parfor?
Heres the concept program with the gory details removed:
global a, b;
n=10
parfor ii=1:n
[a,b]=some_function(x,y);
end
From: neil on 19 Jul 2010 00:24
"Fahim Chandurwala" <fchandur(a)gmail.com> wrote in message <i2074k$eog$1(a)fred.mathworks.com>...
> Greetings:
> I am trying to convert a normal for loop into a parfor loop. The problem I have is that two of the global variables that are declared outside the parfor loop are, however, set in the parfor loop. Is there a way around this problem?
> How is it that global variable can be set in for loop and not in parfor?
> Heres the concept program with the gory details removed:
> global a, b;
> n=10
> parfor ii=1:n
> [a,b]=some_function(x,y);
> end

You can access globals but not create them in parfor loops. your function some_function, if using globals will create them in the body of the function.

http://www.mathworks.com/access/helpdesk/help/toolbox/distcomp/bq__cs7-1.html
http://blogs.mathworks.com/loren/2009/10/02/using-parfor-loops-getting-up-and-running/

I'm pretty sure globals in parfor loops is a bad idea. since it will be difficult to control what the value of the global is when. I would stay away from it if I was you.
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