Outputting even numbers using logical indexing and rem.

I am having troubles figuring out How can I output only the even numbers in an array using logical indexing and the rem function?

Thanks!!

Answer 1

[Image Analyst]

Try this:

% Create sample data.
m = randi(9, 1, 20)
% Get the logical indexes of even numbers ONLY.
evenLogicalIndexes = rem(m,2) == 0;
% Extract only those even elements from m
mEven = m(evenLogicalIndexes)

[heehaw]

Oh I see now.

The rem(A,2) provides a 0 if its even and 1 if its odd. So in order to change it so its the other way around we use a logical operator == .

Thanks!!

[Image Analyst]

You could also use ~ to invert it:

oddLogicalIndexes = ~rem(m,2);

Same thing. Perhaps this way is slightly faster for very large arrays.