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D.15.10.2 grtest
Procedure from library gradedModules.lib (see gradedModules_lib).
- Usage:
- grtest(M), anyting M
- Return:
- 1 if M is a valid graded object, 0 otherwise
- Purpose:
- validate a graded object
- Note:
- M should be an ideal or module or matrix, with weighting attribute
'isHomog' and optionally total graded degrees attribute 'degHomog'.
Attributes should be compatible with the presentation matrix.
Example:
| | LIB "gradedModules.lib";
ring r=32003,(x,y,z),dp;
// the following calls will fail due to tests in grtest:
// grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0) ); // not enough row weights
// grobj( module([x,0], [0,0,0], [0, y]), intvec(1,2,3) ); // zero column needs (otherwise optional) total degrees
// grobj( module([x,0], [0,0,0], [0, y]), intvec(1,2,3), intvec(1, 1, 1) ); // incompatible total degrees (on non-zero columns)
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