As Oscar pointed out, it's not clear that this would actually be more efficient. However, some things that could help, based on what you've said, are
- Use Poly and any relevant Poly methods to represent and manipulate polynomial expressions - Make sure gmpy2 is installed. If it is, SymPy will automatically use it for much faster integer operations, especially when using Poly. - Rewrite your recursive function to operate non-recursively. Recursive functions are slower in Python than normal loops. Aaron Meurer On Sat, Aug 6, 2022 at 8:08 AM Thomas Ligon <thomassli...@gmail.com> wrote: > Is there any way to do this, perhaps just by saying that I want to keep > prime factors instead of decimal digits? > Background: I am writing software (using Python and SymPy) to calculate > the coefficients of a power series. By using Rational(0) to initialize sums > and Rational(1,2) to avoid getting a floating point, I have results that > are always rational, specifically quotients of large integers and have > reached the point where the integers have about 50 digits. I have a (fairly > complex) recursive function that calculates the coefficient of x**(n+1) > when the coefficients of x**n are known. When calculating the sum of two > rational numbers, this most likely calculates the greatest common > denominator, something which is sure to be hard. If all of the integers > were always stored in terms of their prime factors instead of decimal > digits, it would be much more efficient. > Is there such a feature out there somewhere? > > -- > 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 sympy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/7171be2f-67a7-4d48-8eac-5d37571677c4n%40googlegroups.com > <https://groups.google.com/d/msgid/sympy/7171be2f-67a7-4d48-8eac-5d37571677c4n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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 sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6K30P76B8J%2B4rBrqQ0bCzV0OHY%3DJjZjaKb4ZkWzRZUYoA%40mail.gmail.com.
