colon

colon — (:) colon operator

Description

Colon symbol : can be used to form implicit vectors. (see also linspace, logspace)

`j:k`	is the vector `[j, j+1,...,k]` (empty if `j>k`).
`j:d: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)

`A(:)`	is the vector of all the elements of `A` regarded as a single column.
`A(:,j)`	ys the `j`-th column of `A`
`A(j:k)`	is `[A(j),A(j+1),...,A(k)]`
`A(:,j:k)`	is `[A(:,j),A(:,j+1),...,A(:,k)]`
`A(:)=w`	fills the matrix `A` with entries of `w` (taken column by column if `w` is a matrix).