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7.10.6.33 ncrepPencilCombine
Procedure from library ncrat.lib (see ncrat_lib).
- Usage:
- matrix Q = ncrepPencilCombine(pencil);
- Return:
- matrix Q = Q0*x0 + ... + Qg*xg,
where vars = list(x0, ..., xg) consists of polynomials
and matrices = (Q0, ..., Qg) is a list of matrices
Example:
| | LIB "ncrat.lib";
ncInit(list("x", "y"));
ncrat f = ncratFromString("x*y");
ncrep r = ncrepGet(f);
print(r.mat);
==> 0, 0, x, -1,
==> 0, 1, -1,0,
==> y, -1,0, 0,
==> -1,0, 0, 0
list l = ncrepPencilGet(r, list(x, y));
matrix Q = ncrepPencilCombine(l);
print(Q);
==> 0, 0, x, -1,
==> 0, 1, -1,0,
==> y, -1,0, 0,
==> -1,0, 0, 0
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