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7.10.6.28 ncrepRegularZeroMinimize
Procedure from library ncrat.lib (see ncrat_lib).
- Usage:
- ncrep s = ncrepRegularZeroMinimize(q, l);
- Return:
- ncrep s representing the same rational
function as ncrep q, where s is of minimal size
- Assumption:
- q is regular at zero, i.e.,
if one substitutes in 0 for all nc variables in q
then q.mat has to be invertible
- Note:
- list l = list(x1, ..., xn) has to consist
exactly of the nc variables occurring in q
Example:
| | LIB "ncrat.lib";
ncInit(list("x", "y"));
ncrat f = ncratFromString("inv(1+x*y-y*x)");
ncrep q = ncrepGet(f);
ncrepDim(q);
==> 11
ncrep s = ncrepRegularZeroMinimize(q, list(x, y));
ncrepDim(s);
==> 3
s;
==> lvec=
==> 0,1,0
==>
==> mat=
==> 1, y, 0,
==> -x,1, -y,
==> 0, -x,1
==>
==> rvec=
==> 0,
==> -1,
==> 0
==>
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