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D.15.6.32 grrange
Procedure from library gradedModules.lib (see gradedModules_lib).
- Usage:
- grrange(M), graded object M
- Return:
- intvec
- Purpose:
- get weights of module units, thus describing the target of M
Example:
| | LIB "gradedModules.lib";
ring r=32003,(x,y,z),dp;
module Z = grobj(freemodule(0),intvec(0:0),intvec(0:0));
grrange(Z);
==>
grdeg(Z);
==>
grview(Z);
==> Graded homomorphism: 0 <- 0, given by zero (0^2) matrix.
module P=grobj(module([xy,0,xz]),intvec(0,1,0));
grrange(P);
==> 0,1,0
grdeg(P);
==> 2
grview(P);
==> Graded homomorphism: r + r(-1) + r <- r(-2), given by a matrix, with degr\
ees:
==> ..1 ....
==> --- +...
==> 0 : 2 |..1
==> 1 : - |..2
==> 0 : 2 |..3
==> ===
==> 2
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