How can i assign certain length for each column of exported text file?

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Hi,
I am trying to write a 8680*18 cell array in to a text file. But i need to assign certain defferent lenght for elements in each column (i.e. all elements in first have 3 characters and all elements in the second column have 12 characters, etc). can anyone help?
Thank you

Accepted Answer

Walter Roberson
Walter Roberson on 19 Jul 2019
None of the Mathworks supplied tools for writing out matrices support that, so you will need to construct it yourself.
col_widths = [3 12 etc];
fmt_cell = [sprintfc('%%%ds', col_widths), '\n'];
fmt = [fmt_cell{:}];
your_cell_transpose = your_cell.';
fid = fopen('YourFile.txt', 'wt');
fprintf(fid, fmt, your_cell_transpose{:});
fclose(fid);
  3 Comments
Walter Roberson
Walter Roberson on 19 Jul 2019
Ah, that is for mixed datatype; your question sort of implied everything was char.
Your format would have to be touched up for fixed width, such as
formatSpec = '%3s %12d %2.1f %s\n';
Note this is for right-justified in field; if you want left-justified, use a negative width, such as %-3s

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