How to save this matrix?

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Amanda Queiroz
Amanda Queiroz on 24 Dec 2021
Edited: Amanda Queiroz on 28 Dec 2021
I have 12 columns in matrix:
For example:
6,2713 1,0876 23,3585 31,5388 51,1182 27,1688 9,6255 0,7503 0 0 0 0,3299 -5,8128 -37,5098
6,0273 1,0467 22,9448 31,1567 48,5899 26,2585 9,6405 0,7245 0 0 0 0,3299 -5,8173 -37,5098
5,6551 0,9194 22,7827 29,8986 47,5964 24,7148 9,7817 0,6674 0 0 0 0,3299 -5,8217 -37,5098
How to save this matrix with fprintf for txt file?
I tried
fileID = fopen('test.txt','w');
fprintf(fileID,'%.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n',[a,b,c,d,e,f,g,h,i,j,k,l,m,n];

Accepted Answer

dpb
dpb on 24 Dec 2021
If there's just one array/matrix M, then
fid=fopen('test.txt','w');
fmt=[repmat('%.4f',1,size(M,2)) '\n']; % build format string
fprintf(fid,fmt,M.') % write -- NB: to transpose
fid=fclose(fid);
But, I'd recommend using one of the higher-level routines instead of the low-level i/o unless the desired file format is one that can't be written otherwise. See
doc writematrix
and friends...
  1 Comment
Amanda Queiroz
Amanda Queiroz on 27 Dec 2021
Thank you, these commands got it right!

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