@unitvector |

Extracts column from an identity matrix.

Syntax: @unitvector(n1, n2)

n1: integer

n2: integer

Return: vector

Creates an n1 element vector with a 1 in the n2-th element, and 0 elsewhere.

Examples

vector v1 = @unitvector(8, 5)

creates an 8 element vector with a 1 in the fifth element and 0 for the other 7 elements.

vector v2 = @unitvector(8, 3)

matrix h = @mnrnd(8, 8)

matrix hselect1 = h * v2

matrix hselect2 = h.@col(3)

create HSELECT1 and HSELECT2 into which we extract column 3 from the matrix H.

Cross-references