Re: Matrix resizing

[Chengqi Zhang]

On Sun, 07 Mar 2010 02:03:33 +0800, Marius Roets <address@hidden>  
wrote:

> Is there a vectorized way to delete every other row/column in a matrix?  
> Similarly to duplicate every other row/column?
a=magic(7)
%1-1, To delete every other row(only the 1st, 3rd, 5th, ... left)
result=a(1:2:end,:)

%1-2, To delete every other row(only the 2nd, 4th, 6th, ... left)
result=a(2:2:end,:)


%1-3, To delete every other col(only the 1st, 3rd, 5th, ... left)
result=a(:,1:2:end)


%1-4, To delete every other row(only the 2nd, 4th, 6th, ... left)
result=a(:,2:2:end)

%2-1, To duplicate every other row(duplicate 1st, 3rd, 5th, ...)
result=kron(a(1:2:end,:),[1;1])


%2-2, To duplicate every other col(duplicate 1st, 3rd, 5th, ...)
result=kron(a(:,1:2:end),[1,1])

--
Best Regards!
---------------------------
Sincerely,                      Chengqi Zhang
China Center for Economic Research
Mail: address@hidden
Personal Website: http://macro2.cn