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

Question

Tin Nguyen 2015-10-13

评论： Star Strider 2015-10-13

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

r =

2876 + 0.3069i
2876 - 0.3069i
3127 + 0.0000i

And I wanted to change any complex numbers to 0?

Answer 1

Star Strider 2015-10-13

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 2015-10-13

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

Star Strider 2015-10-13

My pleasure.

To replace them with NaN, the assignment becomes:

r(imag(r) ~= 0) = NaN
r =
             NaN
             NaN
   312.7000e-003