ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Fri, 01 Jul 2011 15:16:49 +0200wxMaxima cannot reduce system to a polynomial in one variablehttps://ask.sagemath.org/question/8204/wxmaxima-cannot-reduce-system-to-a-polynomial-in-one-variable/I'm attempting to use wxMaxima 11.04.0 to solve some non-linear equations symbolically, but I get the error "algsys: tried and failed to reduce system to a polynomial in one variable; give up.". Having solved these eqns by hand, I believe there is a solution. Since I am new to wxMaxima, I am probably using it incorrectly. Can someone suggest how I can get the solution I want?
Here is the wxMaxima transcript:
(%i1) A14:d=s*r/(D*M);
A11:\alpha *\eta *(M*(1-d)/\rho)^(1/3)*D=r/F;
(%o1) d=(r*s)/(D*M)
(%o2) (alpha*(1-d)^(1/3)*eta*D*M^(1/3))/rho^(1/3)=r/F [this is actually rendered with Greek letters]
(%i3) solve([%o1,%o2],[d,D]);
algsys: tried and failed to reduce system to a polynomial in one variable; give up.
Substituting d from A14 into A15 yields a cubic in D. I would like to see that, and also the solution of that cubic. For values of the parameters s, r, etc that I will use, there will be only one real root, but of course 'solve' can't know that, as I have asked for a symbolic solution.
WoodySMFri, 01 Jul 2011 15:16:49 +0200https://ask.sagemath.org/question/8204/