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Re: sympy

From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Subject Re: sympy
Date 2016-04-01 04:05 +1100
Message-ID <mailman.272.1459443911.28225.python-list@python.org> (permalink)
References (1 earlier) <56fbcd01$0$1599$c3e8da3$5496439d@news.astraweb.com> <99b7cf43-50ff-4de7-8de0-e324658682bf@googlegroups.com> <56fbf7e7$0$1591$c3e8da3$5496439d@news.astraweb.com> <244e1277-e105-4419-a449-7f2012c6d78e@googlegroups.com> <ndjdpv$bkd$1@ger.gmane.org>

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On Fri, Apr 1, 2016 at 1:55 AM, Peter Otten <__peter__@web.de> wrote:
> Hm, the two functions fmsympy() and fm() do not return the same value:
>
> $ python -i sympy_diff.py
> 10000  evaluations with sympy   : dt1 = 0.7178411483764648
> 10000  evaluations without sympy: dt2 = 0.10177111625671387
>>>> fm(42)
> cos(42)
>>>> fmsympy(42)
> -0.399985314988351
>

Maybe not, but that's simply because one of them is completely
evaluated. The cosine of 42 radians is indeed -0.4ish.

>>> math.cos(42)
-0.39998531498835127

ChrisA

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Thread

sympy Poul Riis <priisdk@gmail.com> - 2016-03-30 04:17 -0700
  Re: sympy Ben Finney <ben+python@benfinney.id.au> - 2016-03-30 22:29 +1100
  Re: sympy Ned Batchelder <ned@nedbatchelder.com> - 2016-03-30 04:39 -0700
  Re: sympy Steven D'Aprano <steve@pearwood.info> - 2016-03-30 23:56 +1100
    Re: sympy Poul Riis <priisdk@gmail.com> - 2016-03-30 08:23 -0700
      Re: sympy Robert Kern <robert.kern@gmail.com> - 2016-03-30 16:29 +0100
      Re: sympy Steven D'Aprano <steve@pearwood.info> - 2016-03-31 02:59 +1100
        Re: sympy Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-03-31 17:49 +1300
          Re: sympy Poul Riis <priisdk@gmail.com> - 2016-03-30 23:51 -0700
        Re: sympy Poul Riis <priisdk@gmail.com> - 2016-03-31 03:57 -0700
          Re: sympy Peter Otten <__peter__@web.de> - 2016-03-31 16:55 +0200
          Re: sympy Chris Angelico <rosuav@gmail.com> - 2016-04-01 04:05 +1100
          Re: sympy Peter Otten <__peter__@web.de> - 2016-03-31 19:51 +0200
          Re: sympy Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-03-31 19:59 +0100
  Re: sympy Poul Riis <priisdk@gmail.com> - 2016-03-31 14:33 -0700
    Re: sympy Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-03-31 23:26 +0100

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