Odd and even numbers

Neeta Dsouza answered . 2024-12-22 09:08:42

You simply have to go back to the definition of odd and even. An (integer) number is even if it is divisible by 2, odd otherwise. Divisible by 2 means that the remainder when divided by 2 is 0. That is easy to test, the function to get the remainder is (or you can use ). As with many things in matlab you do not need a loop, the functions work on vector / matrices

m = [1 2 3;4 5 6]; 
iseven = rem(m, 2) == 0;

m = [1 2 3; 4 5 6] 
iseven = rem(m,2) == 0; 
m_even = m(iseven) 
isodd = rem(m,2) == 1; 
m_odd = m(isodd) 

If you want to execute some statements based on whether the positive number in m is even or odd, you can make a conditional statement within a “for” loop:

for i = 1:numel(m) 
  if rem(m(i),2) == 0 
    % statements to execute for even m(i)   
  else 
    % statements to execute for odd m(i) 
  end 
end 

Otherwise, if you have a matrix of integer numbers that can be negative in general, use "mod" instead of "rem" in the above example.

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