How to concatenate matrices horizontally?

Question

I have two 3-by-3 matrices:

A= [ 1 2 3 
     1 1 1
     0 1 1] 

B= [ 1 2 1 
     1 1 1
     2 2 2]

How do I concatenate the

Answer 1

There are a few possibilities here. The easiest, and most common one:

concat = [A, B]

The following is considered more robust by some, (because one might, on accident, do concat = [A; B], which would concatenate them vertically):

concat = horzcat(A, B)

Answer 2

Simply do:

concat = [A B]; 

This will make a new matrix that pieces A and B together horizontally (i.e. concatenates).

Another possibility is to use cat where you specify the second dimension (column-wise) to concatenate the two matrices together.

concat = cat(2, A, B);

Alternatively you can use horzcat as alluded by a few people here. This essentially is syntactic sugar for cat in the second dimension.

concat = horzcat(A, B);