How do I put spaces before a line in a txt file using strcat and fprintf?
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How do I put spaces before a line in a txt file using strcat and fprintf?
When I go in MATLAB and try to print ' 1,2,3' in the file opened in fid_wrt as shown below. I will find that the file has '1,2,3', without the spaces.
B{1} = '%.4f,%.4f,%.4f';
fprintf(fid_wrt,strcat(' \n',B{1},','),1:1:3);
I tried adding the spaces before \n...after it...nothing. I just can't get those spaces in the fid_wrt file. I just want those spaces before the numbers man. Whats weird is that fprintf (without writing in the file) does show those spaces in the command window!!
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Accepted Answer
Stephen23
on 16 Apr 2023
STRCAT removes whitespace characters. The easy and robust approach is separate FPRINTF calls:
fprintf(fid_wrt,' \n')
fprintf(fid_wrt,B{1},1:1:3)
fprintf(fid_wrt,',')
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More Answers (1)
Image Analyst
on 16 Apr 2023
strcat does an automatic trim of spaces. Just use fprintf alone. No need for B or strcat.
% Have a line with spaces on it before the line with numbers on it.
fprintf(fid_wrt,' \n%.4f, %.4f, %.4f\n', 1 : 3);
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Image Analyst
on 16 Apr 2023
Edited: Image Analyst
on 16 Apr 2023
You could put B in as a string
% Define a format specifier string using B.
B{1} = ' \n%.4f,%.4f,%.4f\n';
formatSpecifier = B{1};
% Have a line with spaces on it before the line with numbers on it.
fprintf(fid_wrt, formatSpecifier, 1 : 3);
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