printing matrix with real and complex numbers

I have a matrix containg some real numbers and some imaginary numbers (eigenvalues).

I used following code to print to file

   fprintf(fid,'%f %f\n',real(eigenValues), imag(eigenValues));

This code is ok if all are imaginary numbers. When some elements are only real, this code takes adjacent element and says that it is a imaginary. For eg.

Eigenvalue=
-203.122425981375 + 0.00000000000000i
-0.378775249508577 + 81.5733975555839i
-0.378775249508577 - 81.5733975555839i
-1.52421833698961 + 58.2049500388907i
-1.52421833698961 - 58.2049500388907i
-2.35088199995723 + 20.1918127788066i
-2.35088199995723 - 20.1918127788066i
-10.5006520053745 + 0.00000000000000i

But output to the file is

-203.122426 -0.378775
-0.378775 -1.524218
-1.524218 -2.350882
-2.350882 -10.500652
0.000000 81.573398
-81.573398 58.204950
-58.204950 20.191813
-20.191813 0.000000

Please help. fast.

Answer 1

[Walter Roberson]

Your code is not correct even if everything has non-zero imaginary coefficients. You need

fprintf(fid,'%f %f\n',[real(eigenValues(:)), imag(eigenValues(:)].' );

This code can be simplified if it is known for sure that eigenValues is a row vector. In that special case,

fprintf(fid,'%f %f\n',[real(eigenValuess); imag(eigenValues)] );

Remember, fprintf goes down columns when determining what to print next.

[Walter Roberson]

You didn't really say what you wanted to do with the larger matrix that combines real and imaginary values, so I had to guess. This code notices when entire columns are real-valued and omits printing the imaginary parts for those columns.

Letting your matrix be MAT,

formats = {'%f\t', '%f %+fi\t'};   %you can use ' ' instead of '\t'
rMAT = real(MAT);
iMAT = imag(MAT);
needs_imag = any(iMAT);          %columnwise test if any imaginary component
T = formats(needs_imag + 1);     %those ones get different format
fmt = [T{:}];
fmt(end) = sprintf('\n');

jointMAT = reshape([rMAT; iMAT], size(MAT,1), []);
jointselector = reshape( [true(1,size(MAT,2)); needs_imag], 1, []);
joint_to_emit = jointMAT(:, jointselector);

fprintf( fmt, joint_to_emit.' );

Answer 2

[nirmal joshi]

thanks that helped a lot. Now could you please tell me the solution for the matrix of such kind as below (n*n matrix with mixed real and real+imag numbers):

0.00492313930954967 + 0.00000000000000i  -0.000950219597881420 + 0.000116334561424967i  -0.000950219597881420 - 0.000116334561424967i  0.00250610909631282 + 0.000131274110324684i  0.00250610909631282 - 0.000131274110324684i  -0.00878994543063407 - 0.00290189331280875i  -0.00878994543063407 + 0.00290189331280875i  0.0952321817243563 + 0.00000000000000i
0.000215354342101627 + 0.00000000000000i  0.000279237290606386 - 0.00885850893055061i  0.000279237290606386 + 0.00885850893055061i  -0.000564605177494268 + 0.0162064497420263i  -0.000564605177494268 - 0.0162064497420263i  -0.00700806431294748 - 0.0239971293757875i  -0.00700806431294748 + 0.0239971293757875i  0.0832384070238751 + 0.00000000000000i
9.42658185263975e-06 + 0.00000000000000i  0.000289914499551605 + 0.0120234671842429i  0.000289914499551605 - 0.0120234671842429i  -0.00120988395040322 + 0.00453319372311672i  -0.00120988395040322 - 0.00453319372311672i  -0.00495242960762889 - 0.0398653109929623i  -0.00495242960762889 + 0.0398653109929623i  0.0758949072105734 + 0.00000000000000i
5.56029916323066e-07 + 0.00000000000000i  -0.000300371318816607 - 0.00763953150395058i  -0.000300371318816607 + 0.00763953150395058i  0.000627704975245643 - 0.0148071554985026i  0.000627704975245643 + 0.0148071554985026i  -0.00380520630845819 - 0.0473718174702857i  -0.00380520630845819 + 0.0473718174702857i  0.0727914234389611 + 0.00000000000000i
-1.00000000000000 + 0.00000000000000i  -0.00912988576329760 - 0.0775567056756187i  -0.00912988576329760 + 0.0775567056756187i  -0.0114606604719524 + 0.145667864336768i  -0.0114606604719524 - 0.145667864336768i  0.0792586109697300 - 0.170662923716410i  0.0792586109697300 + 0.170662923716410i  -1.00000000000000 + 0.00000000000000i
-0.0437432964133051 + 0.00000000000000i  0.722512902567027 + 0.0261337184494130i  0.722512902567027 - 0.0261337184494130i  -0.942435015977903 - 0.0575649840220967i  -0.942435015977903 + 0.0575649840220967i  0.501020675832976 - 0.0850911030487098i  0.501020675832976 + 0.0850911030487098i  -0.874057545639903 + 0.00000000000000i
-0.00191475017462017 + 0.00000000000000i  -0.980904881053617 + 0.0190951189463831i  -0.980904881053617 - 0.0190951189463831i  -0.262010186867606 - 0.0773308118839508i  -0.262010186867606 + 0.0773308118839508i  0.816595473558801 - 0.00627988940137956i  0.816595473558801 + 0.00627988940137956i  -0.796946009597802 + 0.00000000000000i
-0.000112942145521767 + 0.00000000000000i  0.623296313731386 - 0.0216086435525844i  0.623296313731386 + 0.0216086435525844i  0.860892986574868 + 0.0591048746527951i  0.860892986574868 - 0.0591048746527951i  0.965468460368975 + 0.0345315396310249i  0.965468460368975 - 0.0345315396310249i  -0.764357406508843 + 0.00000000000000i