Issue with fprint() on a (2*3) matrix

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Isma
Isma on 2 Jul 2015
Commented: Isma on 2 Jul 2015
Hi,
I am currently looking for advice to understand the cause the following fprint() matter, to the extent that matrix A is set up correctly:
A=[norm_1d WHS_1d STABLE_1d;normES_1d WHS_ES1d STABLE_ES1d];
fprintf('norm\t whs\t stbl\n');
fprintf('%12.8f %12.8f %12.8f\n',A);
output =[0.0203 0.0233 0.0242 ; 0.0340 0.0301 0.0702]
whereas
expected_output=[0.0203 0.0242 0.0301 ; 0.0233 0.0340 0.0702]
2/ To increase readability on my screen is there a way of adding a descriptive empty column with 2 strings 'va' && 'es' such as:
norm whs stbl
va 0.0203 0.0242 0.0301
es 0.0233 0.0340 0.0702
Thanks and regards

Accepted Answer

James Tursa
James Tursa on 2 Jul 2015
1) A is being printed in the order the elements are in memory. Since the elements are being stored by columns, the order in memory is A(1,1), A(2,1), A(1,2), A(2,2), A(1,3), A(2,3) and that is the order the elements are printed. To get the printing to be by rows instead, just print A' instead of A.
2) If this is fixed text, you could just add this to the format.
fprintf('va %12.8f %12.8f %12.8f\nes %12.8f %12.8f %12.8f\n',A');
  1 Comment
Isma
Isma on 2 Jul 2015
speechless. Just excellent && amazing ( both 1/ && 2/ are tackled quickly with a concise explanation)! respect.

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More Answers (1)

Brendan Hamm
Brendan Hamm on 2 Jul 2015
MATLAB is a column major language, so when it reads in elements of A it reads in order A(1,1), A(2,1),...A(end,1),A(2,1),A(2,2),...A(end,2),...
So to get the output you are looking for transpose A:
fprintf('%12.8f %12.8f %12.8f\n',A.');
  1 Comment
Isma
Isma on 2 Jul 2015
Thanks a lot for the quick and concise feedback, solving point 1/.

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