out of memory error
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I'm trying to join to large arrays (rawS=43914x11 and rawP=23772085x11). My code is
[idxP,idxS] = ismember(out2(:,1),out1(:,1));
out(:,[12,13,14,15,16,17,18,19,20,21,22]) - rawP(idxP,[1,2,3,4,5,6,7,8,9,10,11]);
This ran just fine the first time I ran it, but runs out of memory now (seemingly at different points each time) on the second line for "out2" . No other programs or processes are running. I Tried restarting the computer of course, using tall arrays, deleting variables after they are not needed and so forth, but nothing seems to works. Short of going next to distributed arrays to parallel workers, I would appreciate greatly any ideas or suggestions. Thanks.
Walter Roberson on 28 Sep 2022
Pre-allocate out to the final size. This will reduce temporary memory use. Also, using : is more memory efficient than indexing at the list of columns.
out = zeros(numel(idxP), 22);
out(:, 1:11) = rawS(idxS(idxP), :);
out(:, 12:24) = rawP(idxP, :);