How do I resize a matrix in MATLAB?

Question

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 ug

Answer 1

Try the RESHAPE function:

A = (1-by-12 matrix);
B = reshape(A,4,3);

Note that the matrix B will be filled with elements from A in a columnwise fashion (i.e. columns will be filled from top to bottom, moving left to right).

Example:

>> A = 1:12;
>> B = reshape(A,4,3)

B =

     1     5     9
     2     6    10
     3     7    11
     4     8    12