Saving data from SPMD loop to client

Hi All,

I'm running an smpd loop like

for c=1:NumLabs

   all_data{c}.X = rand(100,100);

end

matlabpool NumLabs

smpd (NumLabs)

   temp_X = all_data{labindex}.X

   out = function(temp_X);

end

matlabpool close

How can I access the data stored in the composite object 'out' after closing the matlab pool? Is it possible to attach 'out' to "all_data{labindex}.out" in a way that its usable after closing the pool?

Thanks, Manuel.

Answer 1

[Edric Ellis]

After the SPMD block, 'out' is a 'Composite'. By indexing into the Composite, you ring the values back to the client. To bring a single value back, you can do this:

   one_value = out{1};

If you want to bring all the values back, you could do something like this:

   out_client = out(:);

Answer 2

[Manuel]

Thanks, Edric.

I realize I wasn't very clear. I would like to use the information in out AFTER I close the matlab pool (out is not directly reachable, so I can't do out{1} or out(:)).

Best,

Manuel

[Edric Ellis]

Hi Manuel, You need to do "out_client = out(:);" before closing matlabpool, and then "out_client" will be stored on the client.

[Edric Ellis]

For example:

matlabpool local 2
spmd
  x = rand();
end
x_client = x(:);
matlabpool close
celldisp(x_client)