o=[ 2 5 8 23 67 9 66 21],i need to form a vector-column p and r so that p has odd numers from o=[..] and r that has even numbers from o=[..]

o=[ 2 5 8 23 67 9 66 21],i need to form a vector-column p and r so that p has odd numers from o=[..] and r that has even numbers from o=[..]

Answer 1

[Star Strider]

Use the rem (remainder after division) function to define your vector elements. Dividing an even integer by 2 results in a zero remainder, and dividing an odd integer by 2 results in a remainder of 1.

I’ll let you figure out how ‘logical indexing’ works:

o=[ 2 5 8 23 67 9 66 21];
P = o(rem(o,2) ~= 0);           % Odd
r = o(rem(o,2) == 0);           % Even

[stupid94]

yeah i know with rem but tnx i woud do the saim thing,i guess i forgot to say what's another way to make a program without using rem

[Sean de Wolski]

Use mod or floor(x/2)==x/2.

[Star Strider]

The constraint of not using rem simply means that you have to create your own version. Divide all elements by 2, then use fix or one of its friends to see if there are any remainders:

o=[ 2 5 8 23 67 9 66 21];
q = fix(o/2)-o/2;
p = o(q < 0)
r = o(q == 0)