Getting information about a matrix.
Here is how to get information about the dimensions of a vector or
matrix. In the following A is an m x n matrix,
x is a 1 x n row vector and y is a
m x 1 column vector.
size(A,1) % Number of rows of A = m
size(A,2) % Number of columns of A = n
size(A) % m n where A is m x n
lenght(A) % max(m,n)
length(x) % m
length(y) % n
Note if v is a vector (either row or column) then
length(v) gives the length of v regardless of whether
v is a row or column vector.
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