saving files in a loop with different names

Question

MiauMiau 2015-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/241686-saving-files-in-a-loop-with-different-names

回答： Image Analyst 2015-9-10

采纳的回答： Image Analyst

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Hi

My code looks something like:

for k = 1:length(sixCenters)
      grouped(:,:,k) = fisher_matrix;
      filename = strcat(sixCenters(k),'.mat');
      save(filename,grouped);
      continue; end
end

fisher_matrix is just matrix of doubles, sixCenters is a 6x1 cell, containing charachters like "NYU", "Lond".. The way I construct filename, it is indicated as char, so the line where I want to save the matrix "grouped" throws the following error:

Error using save
Argument must contain a string.
Error in example_Script(line 22)
    save(filename,grouped);

What can I do? Thanks

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Answer 1

Image Analyst 2015-9-10

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Try this:

folder = pwd; % or whatever you want.
for k = 1 : length(sixCenters)  
  grouped(:, :, k) = fisher_matrix;
  baseFileName = sprintf('%s.mat', sixCenters{k});
  fullMatFileName = fullfile(folder, baseFileName);
  save(fullMatFileName, 'grouped');  
end

Then please please read the FAQ: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

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Answer 2

Hamoon 2015-9-9

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you should pass the string of the name of your variable, use this:

save(filename,'grouped');

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MiauMiau 2015-9-9

that does NOT solve the problem, same error message. the problem is as indicated with filename

Hamoon 2015-9-9

编辑：Image Analyst 2015-9-10

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oh, you've got problem with filename too. you should use braces instead of parentheses for a cell array to get its value, when you use parentheses you refer to a cell with one dimension. So rewrite that section of your code as:

filename = strcat(sixCenters{k},'.mat');

and also you need to do what I said before:

save(filename,'grouped');

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