displaying matrix in .txt file (fprintf)

Hello.

I have matrix with complex numbers with different numbers of digits. I want to print them to the file but they are not aligned.

|1.00+0.00i            1.00+0.00i            1.00+0.00i            1.00+0.00i|
 |0.00+0.00i            -49.00+4.00i            -49.00-4.00i            -52.00+0.00i|
 |0.00+0.00i            -2417.00-0.00i            -2417.00+0.00i            -2392.00+0.00i|
 |0.00+0.00i            -117649.00-64.00i            -117649.00+64.00i            -117676.00+0.00i|

I need something like this:

 |1.00+0.00i                  1.00+0.00i                   1.00+0.00i                   1.00+0.00i|
 |0.00+0.00i                -49.00+4.00i                 -49.00-4.00i                 -52.00+0.00i|
 |0.00+0.00i              -2417.00-0.00i               -2417.00+0.00i               -2392.00+0.00i|
 |0.00+0.00i            -117649.00-64.00i            -117649.00+64.00i            -117676.00+0.00i|

This is code that I print it into file

 for k=1:n
        fprintf(fileID,' |%.2f%+.2fi            %.2f%+.2fi            %.2f%+.2fi            %.2f%+.2fi|\r\n',[real(A(k,:));imag(A(k,:))]);
    end
    fprintf(fileID, '\r\n\r\n\r\n');

Is there any way to make this matrix more aligned?

Answer 1

[Raj]

Just tweaked you code itself a little bit:

fileID=fopen('MyFile.txt','w'); % Open text file for writing
 for k=1:3
        fprintf(fileID,' |%.2f%+.2fi            %10.2f%+.2fi            %10.2f%+.2fi            %10.2f%+.2fi|\r\n',[real(A(k,:));imag(A(k,:))]);
 end
 fprintf(fileID,' |%.2f%+.2fi            %10.2f%+.2fi           %10.2f%+.2fi           %10.2f%+.2fi|\r\n',[real(A(4,:));imag(A(4,:))]);
 fprintf(fileID, '\r\n\r\n\r\n');
fclose(fileID); % Close the file

Gives:

Answer 2

[Stephen23]

No loop required:

mat = [1,1,1,1;0,-49+4i,-49-4i,-52;0,-2417,-2417,-2392;0,-117649-64i,-117649+64i,-117676];
fmt = ' |%.2f%+.2fi %21.2f%+.2fi %21.2f%+.2fi %21.2f%+.2fi|\n';
fprintf(fmt,permute(cat(3,real(mat),imag(mat)),[3,2,1]))

Giving:

 |1.00+0.00i                  1.00+0.00i                  1.00+0.00i                  1.00+0.00i|
 |0.00+0.00i                -49.00+4.00i                -49.00-4.00i                -52.00+0.00i|
 |0.00+0.00i              -2417.00+0.00i              -2417.00+0.00i              -2392.00+0.00i|
 |0.00+0.00i            -117649.00-64.00i            -117649.00+64.00i            -117676.00+0.00i|

Note that if you want to perfectly align all columns and the number of digits of the imaginary part is non-constant (like with your example data) then you will need to create the substrings first, padd/trim them to some length, and then fprint them.

Note that if you open the file in text mode you can simplify your format definitions by just using the newline, e.g.:

fid = fopen(..., 'wt'); % text mode!
fprintf(fid,'... \n') % \r is automatically added! (on Windows)
fclose(fid)

Answer 3

[Filip Puczek]

Thank you very much guys. Now it looks perfect :)