PositiveGrading4 |
Syntax |
PositiveGrading4(M:MATRIX):MATRIX |
Description |
Weights Modifier) CoCoA-4 does not allow zero entries in the first row of the weights matrix. This function returns a matrix which has an extra first row which is a suitable combination of the following rows and has no zero entries. This we can work in CoCoA-4 with any positive grading being the first component the multidegree redundant.
Example |
G := Mat([[1,1,1,0,0], [0,0,0,1,1]]); PG := PositiveGrading4(G); Use Q[x[1..5]], Weights(PG); MDeg(x[2]); -- ignore the first entry to get the degree wrt G [1, 1, 0] ------------------------------- Tail(MDeg(x[2])); [1, 0] ------------------------------- |
See Also |