Write data from for loop into a file
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I want to write a file that displays the following output:
period 1 step 1
save
period 1 step 2
save
period 2 step 1
save
The for loop creates the correct output I want but creates an empty .txt file.
for i=1:951
for j=1:2
s=fprintf('period %d step %d \n\tsave\n',i,j);
end
end
fileID = fopen('SA_SP951.txt','w');
fprintf(fileID,s);
fclose(fileID);
采纳的回答
You need to open the file before the loop, print the text inside the loop, and close the file after the loop:
[fid,msg] = fopen('SA_SP951.txt','wt');
assert(fid>=3,msg)
for ii = 1:951
for jj = 1:2
fprintf(fid, 'period %d step %d \n\tsave\n', ii, jj)
end
end
fclose(fid);
Or alternatively you could collect the character vectors that you generate inside loop into one array (e.g. a cell array) (which seems to be what you were trying to do), but this would be more complex, less efficient, and has no obvious benefit for your requirements.
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