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D.15.23.24 isPrimitiveSublattice

Procedure from library multigrading.lib (see multigrading_lib).

Purpose:
check whether the given set of integral vectors in ZZ^m, i.e. the columns of A, generate a primitive sublattice in ZZ^m (a direct summand of ZZ^m).

Returns:
int, where 0 is false and 1 is true.

Example:
 
LIB "multigrading.lib";
intmat A[3][2] =
1,4,
2,5,
3,6;
// should be 0
int b = isPrimitiveSublattice(A);
print(b);
==> 0
// another example
intmat B[2][2] =
1,0,
0,1;
// should be 1
int c = isPrimitiveSublattice(B);
print(c);
==> 1
kill A, b, B, c;