How do I resize a matrix in MATLAB?

 Suppose I had a 1-by-12 matrix and I wanted to resize it to a 4-by-3 matrix. How could I do this?

My current solution is kind of ugly: 

for n = 1:(length(mat)/3)
    out(n,1:3) = mat( ((n-1)*3 + 1):((n-1)*3 + 3) );

Is there a better way to do this?  

NOTE:-

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Answers: 
reshape is of course the proper solution, as stated by @gnovice.
A nice feature of reshape is that it allows this: 
 
 A = 1:12;
B = reshape(A,4,[]);
B =
     1     5     9
     2     6    10
     3     7    11
     4     8    12
So if you don't know how many columns there will be, reshape will compute it for you. Likewise, reshape will fill in the number of rows, if you leave that out.  
SEE COMPLETE ANSWER CLICK THE LINK  
https://matlabhelpers.com/questions/how-do-i-resize-a-matrix-in-matlab-.php

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