How to find complex numbers in an array and turn it into something else?

So if I had an array that contains real numbers and complex number such as this:

r =

   0.2876 + 0.3069i
   0.2876 - 0.3069i
   0.3127 + 0.0000i

And I wanted to change any complex numbers to 0?

Answer 1

[Star Strider]

This works:

r = [0.2876 + 0.3069i
   0.2876 - 0.3069i
   0.3127 + 0.0000i];

r(imag(r) ~= 0) = 0

r =

       0.0000e+000
       0.0000e+000
     312.7000e-003

Test for the imaginary part to be not equal to zero to get only the real values. Then set the complex values to zero.

[Tin Nguyen]

Thank you very much. How about if I want to make it NaN?

[Star Strider]

My pleasure.

To replace them with NaN, the assignment becomes:

r(imag(r) ~= 0) = NaN

r =
             NaN
             NaN
   312.7000e-003