extracting only real numbers (not real part) from a vector

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Paul Rogers
Paul Rogers 2020-7-18
评论： Walter Roberson 2020-7-18
I have these 2 vector, phi, and psi.
both have complex number from the 1st to 4864th element, then from 4865th to the last real number.
I'd like to turn phi into a vector, let's say a, and psi, b, which contains only the valus that are real.
Like this the attached files:
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Walter Roberson
Walter Roberson 2020-7-18
"both have complex number from the 1st to 4864th element,"
That is not correct: psi and phi both start with 0, which is not a complex number.
"both have complex number from the 1st to 4864th element, then from 4865th to the last real number."
No, the first element (after the very first) with imaginary part 0 is element 4858.

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madhan ravi
madhan ravi 2020-7-18
vectors = [phi, psi];
vectors(4865:end, :)
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madhan ravi
madhan ravi 2020-7-18
phi_psi = [phi, psi];
ix = imag([phi, psi]) == 0;
idx = find(all(ix, 2), 1);
Wanted = phi_psi(idx : end, :)

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