Remove Terms in Complex Valued Data That Has Only Real or Imaginary Part

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MarshallSc le 13 Juin 2022

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https://fr.mathworks.com/matlabcentral/answers/1739720-remove-terms-in-complex-valued-data-that-has-only-real-or-imaginary-part

Commenté : Voss le 13 Juin 2022

LR.mat

I have a complex numeric array (file attached) that some of its terms have only real or imaginary part, and the rest have both the real and imaginary part. How can I remove the terms in the array that has only one term (real or imaginary) so that the terms that has both real and imaginary are left in the array? For example, for the first 8 rows of the data, I want to remove the first 7 terms:

000 + 0.254i
000 + 0.317i
000 + 0.298i
-0.0467 + 0.000i
000 + 0.317i
000 + 0.401i
000 + 0.437i
-0.0453 + 0.0029i % only this term is needed

Thank you!

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Answer 1

Voss le 13 Juin 2022

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Modifié(e) : Voss le 13 Juin 2022

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LR.mat

load LR
disp(LR);
   0.0000 + 0.2545i
   0.0000 + 0.3173i
   0.0000 + 0.2984i
  -0.0468 + 0.0000i
   0.0000 + 0.3173i
   0.0000 + 0.4014i
   0.0000 + 0.4377i
  -0.0454 + 0.0029i
   0.0000 + 0.2984i
   0.0000 + 0.4377i
  -0.1659 + 1.8998i
  -0.0399 + 0.0053i
  -0.0468 + 0.0000i
  -0.0454 + 0.0029i
  -0.0399 + 0.0053i
  -0.0347 + 0.0000i
   0.0000 + 0.3649i
   0.0000 + 0.6330i
   0.0000 + 0.3457i
  -0.0406 + 0.0000i
   0.0000 + 0.6330i
   0.0000 + 1.5188i
   0.0000 + 0.4850i
  -0.0389 + 0.0000i
   0.0000 + 0.3457i
   0.0000 + 0.4850i
  -0.2540 + 1.6553i
   0.0000 + 0.0856i
  -0.0406 + 0.0000i
  -0.0389 + 0.0000i
   0.0000 + 0.0856i
  -0.0641 + 0.0000i
  -0.2924 + 0.0069i
  -0.2233 + 0.0000i
  -0.2486 + 0.0000i
  -0.0379 + 0.0000i
  -0.2233 + 0.0000i
  -0.2693 + 0.0000i
  -0.2948 + 0.0000i
  -0.2597 + 0.0000i
  -0.2486 + 0.0000i
  -0.2948 + 0.0000i
 -24.8645 + 0.0000i
  -0.0337 + 0.0000i
  -0.0379 + 0.0000i
  -0.2597 + 0.0000i
  -0.0337 + 0.0000i
  -0.0339 + 0.0000i
  -0.0140 + 0.0000i
  -0.0133 + 0.0000i
   0.0000 + 0.0057i
  -0.0359 + 0.0000i
  -0.0133 + 0.0000i
  -0.0529 + 0.0000i
  -0.0624 + 0.0000i
  -0.0359 + 0.0000i
   0.0000 + 0.0057i
  -0.0624 + 0.0000i
  -0.0346 + 0.1377i
  -0.0336 + 0.0000i
  -0.0359 + 0.0000i
  -0.0359 + 0.0000i
  -0.0336 + 0.0000i
  -0.0339 + 0.0000i

One way:

% remove elements of LR whose real part is 0 or imaginary part is 0
LR(real(LR) == 0 | imag(LR) == 0) = [];
disp(LR);
  -0.0454 + 0.0029i
  -0.1659 + 1.8998i
  -0.0399 + 0.0053i
  -0.0454 + 0.0029i
  -0.0399 + 0.0053i
  -0.2540 + 1.6553i
  -0.2924 + 0.0069i
  -0.0346 + 0.1377i

Another way:

load LR
% keep elements of LR whose real part is non-zero and imaginary part is non-zero
LR = LR(real(LR) ~= 0 & imag(LR) ~= 0);
disp(LR)
  -0.0454 + 0.0029i
  -0.1659 + 1.8998i
  -0.0399 + 0.0053i
  -0.0454 + 0.0029i
  -0.0399 + 0.0053i
  -0.2540 + 1.6553i
  -0.2924 + 0.0069i
  -0.0346 + 0.1377i
load LR
% same but more concise:
LR = LR(real(LR) & imag(LR));
disp(LR)
  -0.0454 + 0.0029i
  -0.1659 + 1.8998i
  -0.0399 + 0.0053i
  -0.0454 + 0.0029i
  -0.0399 + 0.0053i
  -0.2540 + 1.6553i
  -0.2924 + 0.0069i
  -0.0346 + 0.1377i