Re: Is nan in (nan,) correct?

Date	2015-03-06 10:16 -0800
From	Ethan Furman <ethan@stoneleaf.us>
Subject	Re: Is nan in (nan,) correct?
References	(1 earlier) <dd9a23e8-39fc-4a1f-87f1-d2edbcc3e0e6@googlegroups.com> <mailman.101.1425636069.21433.python-list@python.org> <87443f8f-3bd8-4b88-84c1-d20a2fc8cc19@googlegroups.com> <54f9dcdc$0$12987$c3e8da3$5496439d@news.astraweb.com> <6a78957e-d850-4189-923a-fa779a6a9463@googlegroups.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.124.1425665810.21433.python-list@python.org> (permalink)

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On 03/06/2015 10:04 AM, Rustom Mody wrote:
> On Friday, March 6, 2015 at 10:29:19 PM UTC+5:30, Steven D'Aprano wrote:

>> def inverse(x):
>>     return 1.0/x
>>
>> There's an exception there, waiting to bite. If I include inverse() in some
>> complex calculation:
>>
>> def function(x, y):
>>     return atan2(inverse(3*x*y)+1, inverse(1 - x**2 + 3*x - 0.2)**3)
>>
>> values = [function(1.5*x, y+2) for x, y in zip(xx, yy)]

> Ok... Maybe so
> As I said I am not too sure about this
> 
> However you have to give me a little fuller (if not more realistic) example
> [Your xx and yy are what?]

xx and yy are lists of floats, and for your test xx should have at least one zero in it.

> And I have to see if I know how to tweak it nan-less
> And at least maintain hopefully improve the clarity, succinctness of the original!  Not saying I will be able -- just that thats the claim

Good luck.  :)

--
~Ethan~

Thread

Is nan in (nan,) correct? random832@fastmail.us - 2015-03-05 17:26 -0500
  Re: Is nan in (nan,) correct? sohcahtoa82@gmail.com - 2015-03-05 15:11 -0800
    Re: Is nan in (nan,) correct? Ben Finney <ben+python@benfinney.id.au> - 2015-03-06 10:20 +1100
      Re: Is nan in (nan,) correct? sohcahtoa82@gmail.com - 2015-03-05 15:27 -0800
        Re: Is nan in (nan,) correct? Ben Finney <ben+python@benfinney.id.au> - 2015-03-06 10:39 +1100
        Re: Is nan in (nan,) correct? Chris Angelico <rosuav@gmail.com> - 2015-03-06 10:40 +1100
    Re: Is nan in (nan,) correct? Chris Angelico <rosuav@gmail.com> - 2015-03-06 10:25 +1100
  Re: Is nan in (nan,) correct? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-06 13:09 +1100
    Re: Is nan in (nan,) correct? Ben Finney <ben+python@benfinney.id.au> - 2015-03-06 13:55 +1100
    Re: Is nan in (nan,) correct? Ethan Furman <ethan@stoneleaf.us> - 2015-03-05 19:18 -0800
    Re: Is nan in (nan,) correct? Ben Finney <ben+python@benfinney.id.au> - 2015-03-06 14:26 +1100
    Re: Is nan in (nan,) correct? Ethan Furman <ethan@stoneleaf.us> - 2015-03-05 19:44 -0800
    Re: Is nan in (nan,) correct? Chris Angelico <rosuav@gmail.com> - 2015-03-06 14:49 +1100
    Re: Is nan in (nan,) correct? random832@fastmail.us - 2015-03-05 23:37 -0500
      Re: Is nan in (nan,) correct? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-07 04:07 +1100
    Re: Is nan in (nan,) correct? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-06 04:46 +0000
  Re: Is nan in (nan,) correct? Rustom Mody <rustompmody@gmail.com> - 2015-03-06 01:50 -0800
    Re: Is nan in (nan,) correct? Chris Angelico <rosuav@gmail.com> - 2015-03-06 21:01 +1100
      Re: Is nan in (nan,) correct? Rustom Mody <rustompmody@gmail.com> - 2015-03-06 02:22 -0800
        Re: Is nan in (nan,) correct? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-07 03:59 +1100
          Re: Is nan in (nan,) correct? Rustom Mody <rustompmody@gmail.com> - 2015-03-06 10:04 -0800
            Re: Is nan in (nan,) correct? Ethan Furman <ethan@stoneleaf.us> - 2015-03-06 10:16 -0800
      Re: Is nan in (nan,) correct? Grant Edwards <invalid@invalid.invalid> - 2015-03-06 15:34 +0000
    Re: Is nan in (nan,) correct? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-07 03:43 +1100
      Re: Is nan in (nan,) correct? Rustom Mody <rustompmody@gmail.com> - 2015-03-06 09:04 -0800
        Re: Is nan in (nan,) correct? Chris Angelico <rosuav@gmail.com> - 2015-03-07 04:16 +1100
          Re: Is nan in (nan,) correct? Rustom Mody <rustompmody@gmail.com> - 2015-03-06 09:36 -0800
        Re: Is nan in (nan,) correct? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-07 10:33 +1100
          Re: Is nan in (nan,) correct? Rustom Mody <rustompmody@gmail.com> - 2015-03-06 18:37 -0800

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