Hello Kieran,
In MATLAB, we use row x column notation. So a column vector with 45 elements would be 45 x 1.
a = rand(45, 1);
b = rand(45, 1);
c = [a b];
c = horzcat(a, b);
c = cat(2, a, b);
Note that if you're building an array through concatenation in a loop, then you're probably doing something inefficiently. You can preallocate the matrix, and then compute one row at a time instead.
-Cam
