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D.15.17.16 imageLattice

Procedure from library multigrading.lib (see multigrading_lib).

Usage:
imageLattice(Q,L); Q and L are of type intmat

Purpose:
compute an integral basis for the image of the
lattice L under the homomorphism of lattices Q.

Return:
intmat

Example:
 
LIB "multigrading.lib";
intmat Q[2][3] =
1,2,3,
3,2,1;
intmat L[3][2] =
1,4,
2,5,
3,6;
// should be a 2x2 matrix with columns
// [2,-14], [0,36]
imageLattice(Q,L);
==> 2,0,
==> 22,36