How to swap columns of a matrix??

I have a matrix of 8760X30, the first 7 columns need to be swap with some other column. eg. the first and the second columns need to need to be swap with the 8 and 9 column.

Answer 1

[Birdman]

Simple approach(Consider matrix A):

A(:,[1 2 8 9])=A(:,[8 9 1 2])

Answer 2

[Sayali]

a=[ 1 2 3; 2 4 5]