| #### 7.10.6.17 ncrepSubstract Procedure from library `ncrat.lib` (see ncrat_lib). Usage: ncrep s = ncrepSubstract(q, r); q, r both of type ncrep Return: representation s of h = f - g if q, r are representations of f, g Note: operator '-' for ncrep is overloaded with this procedure, hence ncrep s = q - r; yields the same result as ncrep s = ncrepSubstract(q, r); Example:
    LIB "ncrat.lib";
    ncInit(list("x", "y", "z"));
    ncrat f = ncratFromString("x");
    ncrat g = ncratFromString("y");
    ncrep q = ncrepGet(f);
    ncrep r = ncrepGet(g);
    ncrep s1, s2;
    s1 = ncrepSubstract(q, r);
    print(s1);
    ==> lvec=
    ==> 0,1,0,1
    ==>
    ==> mat=
    ==> x, -1,0, 0,
    ==> -1,0, 0, 0,
    ==> 0, 0, -y,1,
    ==> 0, 0, 1, 0
    ==>
    ==> rvec=
    ==> 0,
    ==> 1,
    ==> 0,
    ==> 1
    s2 = q - r;
    print(s2);
    ==> lvec=
    ==> 0,1,0,1
    ==>
    ==> mat=
    ==> x, -1,0, 0,
    ==> -1,0, 0, 0,
    ==> 0, 0, -y,1,
    ==> 0, 0, 1, 0
    ==>
    ==> rvec=
    ==> 0,
    ==> 1,
    ==> 0,
    ==> 1

User manual for Singular version 4.4.1, 2025, generated by texi2html.