[Maxima] difficulty with solve
ferriste at gmail.com
Mon May 11 15:38:14 CDT 2009
Ooops sorry... I had just a look without checking the degree with coeff :-(...
Anyway it should be really better if linsolve could check for linearity.
In data lunedì 11 maggio 2009 22:31:07, reyssat ha scritto:
: > Stefano Ferri a écrit :
> > I had a look at your first problem, and it is linear in y.
> No, it is not linear but cubic ; for instance
> (%i70) coeff(expand(det1),y,3);
> and linsolve is dangerous since it doesn't check for linearity (and its
> documentation says
> "The expressions must each be polynomials in the variables and may be
> equations. ", I don't understand why the word polynomial is used here).
> For instance :
> (%i1) linsolve(y^3+y+1,y);
> (%o1) [y = -
> 1] looks like a bug.
> Eric Reyssat
> > Instead of solve,
> > try linsolve. It solves your problem in less than a second.
> > But look how complicated is the solution, and simplifier cannot help you
> > here.
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