# Ignore answers with imaginarey components

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Justin Bruh on 1 Nov 2016
Edited: Thorsten on 1 Nov 2016
I have a for loop nested inside of another for loop. I am using each for loop to vary a specific number (i.e A and B) to get every possible of combination of them and a corresponding result (C). I end up with a matrix of 3 columns and thousands of rows. I need to find the highest value of C. However all values of C with imaginary components are invalid. Can MATLAB eliminate all the values of C with imaginary components and their corresponding values of A and B to give me a new, and much smaller, matrix?

KSSV on 1 Nov 2016
doc isreal
On using isreal output is a logical 1 if number is real and logical 0 if number is complex. Call isreal on the array which gives 1 and 0 from there eliminate all 0 s which gives you only real.

Thorsten on 1 Nov 2016
Edited: Thorsten on 1 Nov 2016
This is basically the implementation of Dr. Siva Srinivas Kolukula's answer:
ind = ~isreal(C);
A(ind) = [];
B(ind) = [];
C(ind) = [];