Correct Magic Square to text file?

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Neil Ogle
Neil Ogle on 21 Jan 2022
Commented: Neil Ogle on 24 Jan 2022
In the simple script below, why when I open myfile.txt is its composed of A and not B (the transpose of A), even though I asked for the latter in the last line
A = magic(4);
B=A';
fileID = fopen('myfile.txt','w');
nbytes = fprintf(fileID,'%5d %5d %5d %5d\n',B);
  1 Comment
Stephen23
Stephen23 on 21 Jan 2022
A much simpler way to save the matrix is to use WRITEMATRIX or DLMWRITE or similar.

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Answers (2)

Rik
Rik on 21 Jan 2022
Your file is written row by row, while Matlab will read the data in B column by column.
So while most people would not expect this behavior, it is actually the expected behaviour.
You will have to transpose the the array again (or use the original).

Image Analyst
Image Analyst on 21 Jan 2022
Try this:
% Create matrix.
A = magic(5)
% Write it out to a text file.
filename = fullfile(pwd, 'A Magic 5.txt')
writematrix(A, filename, 'Delimiter', ' ');
% Verify by typing it to the command window.
type(filename)
%delete(filename)

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