How can I delete even rows in a matlab Matrix

Hello

My Idea consists in deleting every row with an even index (I wanted to test something).

But this code does not seem to work.

I get the error " Matrix index is out of range for deletion. "

Thank you

Y=magic(10)
%T = Y (1:2:end , 1:3:end );
T=Y

[a,b]=size(T);
for i = 1:a
r=rem(i,2);
   if (r == 0)
   T(i, :)=[];
   end
T
end

Answer 1

[Stephan]

>> A = [1 2 3; 4 5 6; 7 8 9; 0 -1 -2]

A =

     1     2     3
     4     5     6
     7     8     9
     0    -1    -2

>> A(2:2:end,:) = []

A =

     1     2     3
     7     8     9

[Mehdi Jaiem]

It worked thank you

Is it possible also to get every 3rd column in a matrix? I don't want to use A(:, 1:3:end).

I want to be able to delete columns and not copy the wanted ones

[Stephan]

A(:, 1:3:end) = [];

will delete every third column without copying te wanted ones. If you dont want to use this syntax you have to use a loop - but why should you do this?

[Mehdi Jaiem]

I want to get every third column starting from from the first one (it counts). Displayed will be : first, fourth, seventh etc...