extracting two specific columns from matrix (Indexing)

Hi all,

I am trying to extract two columns (1 and 3) from a matrix, but I got an error "Error: Unbalanced or unexpected parenthesis or bracket"

anyone help!!!

clearvars
clc;
xxx=[1 2 3;2 4 5;3 4 5;1 1 1];
x=[(;,1) (:,3)]

Answer 1

[Matt J]

x=xxx(:,[1,3])