colon — (:) colon operator
Colon symbol : can be used to form implicit
vectors. (see also linspace, logspace)
is the vector [j, j+1,...,k] (empty if
j>k).
is the vector [j, j+d, ..., j+m*d]
The colon notation can also be used to pick out selected rows, columns and elements of vectors and matrices (see also extraction,insertion)
is the vector of all the elements of A regarded as a single column.
ys the j-th column of A
is [A(j),A(j+1),...,A(k)]
is
[A(:,j),A(:,j+1),...,A(:,k)]
fills the matrix A with entries of w (taken column by column if w is a matrix).