MATLAB: Reshape does not Use the Columns I Want

Question

So, I have a matrix x=

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16

17 18 19 20

I want to create a 2-column matrix with indefinite numbers of rows and to do that I use

reshape(x,[],2). The result I get is

1 3

5 7

9 11

13 15

17 19

2 4

6 8

10 12

14 16

18 20

But I'd like to have

1 2

5 6

9 10

13 14

17 18

3 4

7 8

11 12

15 16

19 20

What can I do?

Answer 1

For your posted example, simply

[x(:,1:2);x(:,3:4)]

But this begs the question, what is your real problem and what sizes can x be? Always 4 columns or any number of even columns or ???