scoping on parallel thread in matlab

Question

I have 4 distinct large files I'd like to load into memory simultaneously. The following example is not exactly what I'm doing -- but it illustrates to problem:

matlabpool open local 4
spmd
    if labindex==1 
        R = rand(9,9);
      else
        R = rand(4,4);
    end
end
size(R)

when I copy and paste this into the command prompt, R pops up in my work space. but if i save this to a *.m file, size(R) doesn't evaluate -- it gives me an error that R doesn't exist. I've tried using gather and initializing R as a global to no avail. Any ideas?

What do you mean R pops up? You have a semicolon after the lines where R is created. I can't replicate what you describe (Matlab R2012b, OS X 10.8.3). The code above runs normally from the command window, a script M-file, and a function M-file. size(R) prints out every time: a 1-by-4 composite. Did you possibly create a function M-file rather than a script and are trying to access R from the command window after running the file? If it was a function then you're right, it is a scoping issue. Functions have their own scope regardless of if they call spmd or not. — horchler, Commented Jun 7, 2013 at 22:49

yoshi · Accepted Answer · 2013-06-07 23:50:24Z

0

Okay:

I was saving this script as test.m.

Then I was calling it from the command line as: run test.m

But then I ran it as-is from command line: test

'run' must spawn a subprocess which it kills after running or something. this must have been killing the variables. just calling the script straight correctly shares the scope of the workspace with the script.

edited Jun 7, 2013 at 23:50

answered Jun 7, 2013 at 23:34

yoshi

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