How to delete odd columns and odd rows from a image

Hi, I have to delete odd columns and odd rows from a image. When I import an image it's actually a matrix, so I only have to delete odd columns and odd rows from a matrix. How can i do it?

[Dyuman Joshi]

im = (randi(256,20,20,3)-1)/255;
imshow(im)

%removing odd rows
im(1:2:end,:,:)=[];
%removing odd columns
im(:,1:2:end,:)=[];
imshow(im)

Answer 1

[Mathieu NOE]

helllo

try this (A is a array we keep only the even rows and columns)

% create dummy A array
a = (1:10);
for ci = 1:10
    A(ci,:) = a*ci;
end
A

A = 10×10

1 2 3 4 5 6 7 8 9 10 2 4 6 8 10 12 14 16 18 20 3 6 9 12 15 18 21 24 27 30 4 8 12 16 20 24 28 32 36 40 5 10 15 20 25 30 35 40 45 50 6 12 18 24 30 36 42 48 54 60 7 14 21 28 35 42 49 56 63 70 8 16 24 32 40 48 56 64 72 80 9 18 27 36 45 54 63 72 81 90 10 20 30 40 50 60 70 80 90 100

%remove odd cols and rows (equivalent to keep even r & c) 
[m,n] = size(A);

B = A(2:2:m,2:2:n)

B = 5×5

4 8 12 16 20 8 16 24 32 40 12 24 36 48 60 16 32 48 64 80 20 40 60 80 100

[Mathieu NOE]

hello

problem solved ?