Hi, On 3 April 2014 11:58, rgbarriada <[email protected]> wrote: > > Hi all, > > I am trying to solve a very simple equation system. Here is the code: > > import sympy as sp > a, b, c, d = sp.S('a b c d'.split()) > equations = [ > sp.Eq(a, b+c/d), > sp.Eq(c, 60.), > sp.Eq(d, 5.)] > > print sp.solve(equations) > > > So I can have an expression for 'a' as a function of 'b'. > > I am getting this error instead: > > ... > File "/usr/lib/python2.7/dist-packages/sympy/solvers/solvers.py", line > 484, in solve > solution = _solve(f, *symbols, **flags) > File "/usr/lib/python2.7/dist-packages/sympy/solvers/solvers.py", line > 730, in _solve > raise NotImplementedError() > NotImplementedError > > > I am using sympy 0.7.1. > > Any hint of what I am doing wrong?
Nothing, besides using an older version of SymPy. If you try 0.7.5 (or 0.7.4), your example works perfectly there. Note that you can still encounter NotImplementedError in case of equations/systems that SymPy doesn't support. Also, may I suggest using exact numbers, i.e. 60 instead of 60., unless you really want to use a numerical solver (if this is how SymPy works in this particular case). > Thanks in advance > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/4314646e-f6f4-438c-9c68-55ae207117f0%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. Mateusz -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAGBZUCZZYR-zBEDdBgrGQKRE0bFJLM11N9BekD9d1fPdzye1BQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
