On Wed, Apr 2, 2008 at 5:40 PM, Vinzent Steinberg <[EMAIL PROTECTED]> wrote: > > On 1 Apr., 23:46, Mike Hansen <[EMAIL PROTECTED]> wrote: > > Cool. Does your _compile work with functions where there is no C math > > equivalent? How long does it take to compile a function? > > > > --Mike > > Currently it uses only 'math.h' on which the Python module 'math' is > based. Afaik fast_float does the same. Exotic functions could be > supported by either implementing them in Cython or by adding a nice C > math library as a dependency. Is there anything you would wish for? > > Depending on the function it takes 0.3 s (sqrt(x**2+y**2)) up to 1 s > (used benchmark function) on my 2.8 GHz CPU. It's probably mainly > SymPy's fault (I use lambdastr and evalf (to avoid 1/2=0)), so it can > be optimized. But actually I should not blame SymPy without any > benchmark :). Hand-written C would probably compile faster, but I > think 1 s is fine. > > > > Cool, let's put it in then. :) > > _compile currently accepts only SympPy expressions which it converts > to lambda strings. So it could also accept lambda strings directly. It > works exactly like lambdify, it could be merged with it using a flag > like compile=True.
Either that, or adding a function cythonify. Or name it "fast_float" to have the same interface like in Sage. Excellent, let's do it. Ondrej --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sympy?hl=en -~----------~----~----~----~------~----~------~--~---
