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ric
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Post subject: lp to dp Posted: Wed Feb 27, 2008 6:33 pm |
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Hello
I want to compute the Groebner Basis in x > z > y from an Ideal like: <z_i - f(x), y_i - g(x) >
if I choose lp on z the computation is fast and I get a result in 5 minutes. But if I choose dp on z the computation takes a lot more time (> 3h). Unfortunately I need dp on z, so maybe there is a way to transform from lp to dp in short time?
thanks
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hannes
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Post subject: Re: lp to dp Posted: Mon Mar 03, 2008 12:57 pm |
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Joined: Wed May 25, 2005 4:16 pm Posts: 275
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To convert a Groebner basis from one oredering to another you can use fglm (for zero dimensional ideals) or use the Hilbert function to speed up the computation:
ring r1=....; ideal I=....; ideal J=groebner(I); intvec h=hilb(J,1); ring r2=.....; ideal I=fetch(r1,I); ideal J=std(I,h);
Hans Schoenemann, Singular team
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