[sympy] Help isolating, extracting and replacing parts of a rational expression

2013-10-02 Thread Francesco Biscani
Hello, as a complete sympy newbie I am having some problems solving the following problem. I have an expression of the general form: E0/(E1*E2*...*En * (ax+bx+c+d...)) where E0...En are some "constant expressions" and x is my variable of interest. What I need to do is to transform this expres

Re: [sympy] Help isolating, extracting and replacing parts of a rational expression

2013-10-07 Thread Francesco Biscani
Aaron Meurer > > On Wed, Oct 2, 2013 at 3:39 AM, Francesco Biscani > wrote: > > Hello, > > > > as a complete sympy newbie I am having some problems solving the > following > > problem. > > > > I have an expression of the general form: > > >

Re: [sympy] Preprint on Maple's core data structure design

2015-03-05 Thread Francesco Biscani
Hello Ondrej, sorry, I just noticed today the message (I am subscribed to the SymPy mailing list and the gmail tagging filter made this message skip my inbox). On 2 March 2015 at 18:29, Ondřej Čertík wrote: > Hi Jason, > > On Mon, Mar 2, 2015 at 9:37 AM, Jason Moore wrote: > > Though this may

[sympy] What am I doing wrong with apart()?

2015-03-10 Thread Francesco Biscani
Hello list, I feel a bit embarrassed as probably I am doing something blatantly wrong, but I cannot understand what is going here. Consider this snippet (copy pasted from an Ipython notebook): """ import sympy sympy.init_printing() from sympy import Symbol,sqrt,cos,sin,solve,Function,atan,apart,S

[sympy] Re: What am I doing wrong with apart()?

2015-03-10 Thread Francesco Biscani
x + y) On 10 March 2015 at 15:57, Francesco Biscani wrote: > Hello list, > > I feel a bit embarrassed as probably I am doing something blatantly wrong, > but I cannot understand what is going here. Consider this snippet (copy > pasted from an Ipython notebook): > > "&q

[sympy] A Taylor integrator compatible with SymPy

2021-09-29 Thread Francesco Biscani
Hello, we just released the latest version of our Taylor integrator heyoka.py: https://github.com/bluescarni/heyoka.py heyoka.py is an implementation of Taylor's method for the numerical integration of systems of ODEs based on automatic differentiation and just-in-time compilation via LLVM. Cur

Re: [sympy] Re: A Taylor integrator compatible with SymPy

2021-09-30 Thread Francesco Biscani
Hi Chris, thanks for the kind words. I haven't tried the cse=True approach in SymPy, I'll check it out when 1.9 comes out. I would imagine that the outcome will be similar to the CSE in our expression system, but it will be interesting to know if there's something new we can learn. Kind regards,

Re: [sympy] A Taylor integrator compatible with SymPy

2021-10-01 Thread Francesco Biscani
ith some other mechanics problems. > Looks nice! > > Jason > moorepants.info > +01 530-601-9791 > > > On Wed, Sep 29, 2021 at 11:23 PM Francesco Biscani > wrote: > >> Hello, >> >> we just released the latest version of our Taylor integrator heyoka.py:

Re: [sympy] A Taylor integrator compatible with SymPy

2021-10-01 Thread Francesco Biscani
ry things out when I'm > working on those lessons. > > Jason > moorepants.info > +01 530-601-9791 > > > On Fri, Oct 1, 2021 at 9:29 AM Francesco Biscani > wrote: > >> Hi Jason, >> >> cheers! The interoperability with SymPy and its mechanics module is a