if statement inside for loop location issues

Imagine this

A=[B C D E];
B=[1;2;3;1;9,0,4,5];
C=[1;2;3;2;3;2;1;2];
D=[8;3;5;6;1;2;7;4];
E=[-1;-1;-3;-2;-3;-1;-2;-3];

The goal is to compare B and D.

if B<D

then it's corresponding value of C will show in F

If B>=D

then its corresponding E value will show in F.

In this case, the answer is

F=[1;2;3;2;-3;2;1;-3]

How can I achieve this please

Answer 1

[Joel Handy]

This is exactly the situation where you want to use logical indexing.

https://blogs.mathworks.com/loren/2013/02/20/logical-indexing-multiple-conditions/

F(B<D) = C(B<D);
F(B>=D) = E(B>=D);

[DARLINGTON ETAJE]

Thank you Joel...you really saved me...you are the best.