MATLAB: How to get odd rows and columns,even rows and columns

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A1 is the lena image
A is to the first row
similarly how to get the even rows ,even columns,odd rows,odd columns
 A1 = imread('lena1.jpg');
  A=A1(:,1);

Best Answer

Consider you have number of rows and columns which is an even number,
Odd rows:
A1(1:2:end-1,:)
Even rows:
A1(2:2:end,:)
Odd columns:
A1(:,1:2:end-1)
Even columns:
A1(:,2:2:end)
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