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D.15.13.27 primitiveSpan
Procedure from librarymultigrading.lib (see multigrading_lib).
- Purpose:
- compute an integral basis for the minimal primitive
sublattice that contains the given vectors, i.e. the columns of V. - Returns:
- int, where 0 is false and 1 is true.
LIB "multigrading.lib"; intmat V[3][2] = 1,4, 2,5, 3,6; // should return a (3x2)-matrix whose columns // generate the same lattice as [1, 2, 3] and [0, 1, 2] intmat R = primitiveSpan(V); print(R); ==> 1 0 ==> 2 1 ==> 3 2 // another example intmat W[2][2] = 1,0, 0,1; // should return a (2x2)-matrix whose columns // generate the same lattice as [1, 0] and [0, 1] intmat S = primitiveSpan(W); print(S); ==> 1 0 ==> 0 1 kill V, R, S, W; |