| #### 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)

User manual for Singular version 4-0-2, 2015, generated by texi2html.