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Unable to use parfor with strcmpi

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Anurag Passi
Anurag Passi 2017-11-28
评论： Walter Roberson 2017-11-28
Hello, I am trying to use PARFOR in a loop which runs a strcmpi() function. The code is:
parfor i = 1:size(data_1,1)
idx = find(strcmpi(data_1{i,1},data_2(:,1)));
dd = data_2(idx,:);
for j = 1:size(dd,1)
fprintf(file,'%s\t%s\n',dd{j,1},dd{j,2}); % print to file
end
end
I am not able to slice the "data_2" which is a 31mn x 2 cell array due to which I am not able to run parfor. Can anyone suggest how I can modify this program for parfor? Moreover, will this effect the way I am printing the data in the file?
Thank you.
  1 个评论
Walter Roberson
Walter Roberson 2017-11-28
find(strcmpi(data_1{i,1},data_2(:,1)))
... you are expecting multiple matches?
Is either data_1(:,1) or data_2(:,1) a set of unique strings?

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Edric Ellis
Edric Ellis 2017-11-28
编辑：Edric Ellis 2017-11-28
The variable data_2 is not being sliced because every iteration of the parfor loop needs access to the whole array. This is not an error though - the code analyzer warning is simply telling you that the code is incurring extra communication because the whole of data_2 is being sent to each worker.
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Anurag Passi
Anurag Passi 2017-11-28
So I think maybe I should try some other way of working with this data. Thank you for your replies.
Walter Roberson
Walter Roberson 2017-11-28
If either data_1(:,1) or data_2(:,1) are sets of unique strings then ismember() can be used before-hand to find the indexing.

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