how to save an array of strings into a text file using MATLAB

Question

I want to search for strings in a text file 'marine_forservers.txt' according to the indices saved in 'x.txt' and then save those strings in output file This is the code I tried but it can't save strings to files Can anyone help me??

search = importdata('marine_forservers.txt');
patterns=importdata('x.txt');
fid = fopen('outputI.txt','w');
for i=1:length(patterns)
    for j = 1:16709
        if(j==patterns(i))
         str= search(j);
         fprintf(fid, '%s\n', str);
   end
end
end
fclose(fid);

I got this Error in ==> suppI at 8 fprintf(fid, '%s\n', str);

Your code for writing a string to a text file looks okay. I would guess that for some iteration in your double loop str is not a string. Can you provide an example (in the question) of what search and patterns look like? Perhaps we can eliminate that double loop and fix your problem in one hit... ps I don't know who down-voted this but it is not obvious to me why it received a downvote? — Colin T Bowers
– Colin T Bowers, Commented Jan 9, 2013 at 2:05
ok, when I display the value of str I gotstr = 'GGUCUGGGGUAUUGGCAAUAUGGGGUAGAGCAAUACUCUUCCGUGUUAAGAGAAAAUAAUAUUCCAAUCG' ??? Error using ==> fprintf Function is not defined for 'cell' inputs. Error in ==> suppI at 8 fprintf(fid, '%s\n', str); — user1351343
– user1351343, Commented Jan 9, 2013 at 11:08
I'm glad to see you have resolved the problem with the help of @Pete (+1). One other suggestion: I suspect that you could definitely eliminate that double loop from your code and make it run much faster - look into functions like ismember and intersect. — Colin T Bowers
– Colin T Bowers, Commented Jan 10, 2013 at 2:24

Pete · Accepted Answer · 2013-01-09 13:54:40Z

1

This error:

??? Error using ==> fprintf Function is not defined for 'cell' inputs.

Tells you everything you need to know; str is not a character array - it's a MATLAB cell:

http://www.mathworks.com/help/matlab/ref/cell.html

This should fix it:

fprintf(fid, '%s\n', str{1});

As a side note, that is why you should always include the error message text in the original question...

answered Jan 9, 2013 at 13:54

Pete

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user1351343 Over a year ago

Thanks all I tried fprintf(fid, '%s\n', cell2mat( str)); and it works well

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