Singular Manual: grobj

| #### D.15.10.1 grobj Procedure from library `gradedModules.lib` (see gradedModules_lib). Usage: grobj(M, w[, d]), matrix/ideal/module M, intvec w, d Return: graded object with matrix presentation M, row weighting w [and total graded degrees d of columns] Purpose: create a valid graded object with a given matrix presentation, weighting [and total graded degrees (in case of zero columns)] Example:
    LIB "gradedModules.lib";
    ring r=32003,(x,y,z),dp;
    module A = grobj( module([x+y, x, 0, 0], [0, x+y, y, 0]), intvec(0,0,0,1) );
    grview(A);
    ==>        1   2
    ==>      --------
    ==>   0 :  1   . |  1
    ==>   0 :  1   1 |  2
    ==>   0 :  .   1 |  3
    ==>   1 :  .   . |  4
    ==>      ========
    ==>        1   1
    module F = grobj( module([x,y,0]), intvec(1,1,5) );
    grview(F);
    ==>        1
    ==>      ----
    ==>   1 :  1 |  1
    ==>   1 :  1 |  2
    ==>   5 :  . |  3
    ==>      ====
    ==>        2
    int d = 666; // zero can have any degree...
    module Z = grobj( module([x,0], [0,0,0], [0, y]), intvec(1,2,3), intvec(2, d, 3) );
    grview(Z);
    ==>          1    2    3
    ==>       ---------------
    ==>    1 :   1    .    . |   1
    ==>    2 :   .    .    1 |   2
    ==>    3 :   .    .    . |   3
    ==>       ===============
    ==>          2  666    3
    print(Z);
    ==> x,0,0,
    ==> 0,0,y,
    ==> 0,0,0
    attrib(Z);
    ==> attr:degHomog, type intvec
    ==> attr:isHomog, type intvec
    attrib(Z, "isHomog"); // module weights
    ==> 1,2,3
    attrib(Z, "degHomog"); // total degrees
    ==> 2,666,3

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