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D.15.13.2 getVariableWeights
Procedure from library multigrading.lib (see multigrading_lib).
- Usage:
- getVariableWeights([R])
- Purpose:
- get associated multigrading matrix for the basering [or R]
- Return:
- intmat, matrix of multidegrees of variables
Example:
| | LIB "multigrading.lib";
ring R = 0, (x, y, z), dp;
// Weights of variables
intmat M[3][3] =
1, 0, 0,
0, 1, 0,
0, 0, 1;
// Grading group:
intmat L[3][2] =
1, 1,
1, 3,
1, 5;
// attaches M & L to R (==basering):
setBaseMultigrading(M, L); // Grading: Z^3/L
// Weights are accessible via "getVariableWeights()":
getVariableWeights() == M;
==> 1
kill L, M;
// ----------- isomorphic multigrading -------- //
// Weights of variables
intmat M[2][3] =
1, -2, 1,
1, 1, 0;
// Grading group:
intmat L[2][1] =
0,
2;
// attaches M & L to R (==basering):
setBaseMultigrading(M, L); // Grading: Z + (Z/2Z)
// Weights are accessible via "getVariableWeights()":
getVariableWeights() == M;
==> 1
kill L, M;
// ----------- extreme case ------------ //
// Weights of variables
intmat M[1][3] =
1, -1, 10;
// Grading group:
intmat L[1][1] =
0;
// attaches M & L to R (==basering):
setBaseMultigrading(M); // Grading: Z^3
// Weights are accessible via "getVariableWeights()":
getVariableWeights() == M;
==> 1
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