addCokerGrading(R)
addCokerGrading(R,L)
addCokerGrading(R,A)
Stores a cokernel grading (Cox grading) in a polynomial ring. This data is accessed by FirstOrderDeformation to compute the small torus degree(FirstOrderDeformation) of a deformation, and by Complex and CoComplex to store the vertices.
The number or rows of A has to match the number of variables of R.
If A is not specified, raysPPn R is used.
If L is specified then the grading of a weighted projective space is added.
This command does not change the behaviour of R with respect to the standard Macaulay2 image grading, which we want to use independently.
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Weighted projective space:
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The object addCokerGrading is a method function.