How could I extract the first two columns, and leave the next two and then so on from a matrix

for example I have 100 columns, then how could I extract the first two and then leave the next two columns like this (1,2,5,6,9,10,13,14,..............97,98)..

Answer 1

[Joel Handy]

% Set up example data set
A = eye(100);
A(1,:) = 1:100;
numCols = size(A,2);

% Answer
B = A(:,sort([1:4:numCols 2:4:numCols]));

% Verification
size(B)
B(1,:)

[Salman Ahmad]

thank you very much it works...