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Re: Functional programming

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Date Wed, 5 Mar 2014 00:01:01 +1100
Subject Re: Functional programming
From Chris Angelico <rosuav@gmail.com>
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On Tue, Mar 4, 2014 at 10:47 PM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> Not even close. I'd like to see the compiler that can work out for itself
> that this function is buggy:
>
> def sine_rule(side_a, side_b, angle_a):
>     """Return the angle opposite side_b."""
>     return math.sin(side_b/side_a)*angle_a
>
>
> If you don't remember your Sine Rule from trigonometry, that's okay.
> Trust me, the function is badly wrong. It's rubbish really.

I'm not entirely sure what it's trying to do, but you're taking the
sine of a ratio. That... seems wrong, gut-feeling-wise. You take the
sine of an angle and get a ratio, or the arcsine of a ratio and get an
angle. Also, trig functions apply only to right triangles, so the
other angle is either going to be 90°-angle_a or 90°, depending on
whether you want the angle opposite the hypotenuse or not.

But it's years since I studied any of that.

ChrisA

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Thread

Re: Functional programming Ned Batchelder <ned@nedbatchelder.com> - 2014-03-02 20:27 -0500
  Re: Functional programming Rustom Mody <rustompmody@gmail.com> - 2014-03-03 03:45 -0800
    Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-03 23:20 +1100
      Re: Functional programming Rustom Mody <rustompmody@gmail.com> - 2014-03-03 05:48 -0800
        Re: Functional programming Rustom Mody <rustompmody@gmail.com> - 2014-03-03 05:51 -0800
        Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-04 01:00 +1100
          Re: Functional programming Rustom Mody <rustompmody@gmail.com> - 2014-03-03 06:08 -0800
            Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-04 01:23 +1100
              Re: Functional programming Rustom Mody <rustompmody@gmail.com> - 2014-03-03 06:38 -0800
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-04 02:01 +1100
                Re: Functional programming Rustom Mody <rustompmody@gmail.com> - 2014-03-03 07:28 -0800
                Re: Functional programming Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-03 17:27 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-04 05:37 +1100
                Re: Functional programming Steven D'Aprano <steve@pearwood.info> - 2014-03-04 05:35 +0000
                Re: Functional programming Rustom Mody <rustompmody@gmail.com> - 2014-03-03 21:59 -0800
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-04 17:04 +1100
                Re: Functional programming Rustom Mody <rustompmody@gmail.com> - 2014-03-03 22:20 -0800
                Re: Functional programming Steven D'Aprano <steve@pearwood.info> - 2014-03-04 08:56 +0000
                Re: Functional programming Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2014-03-04 11:56 +0100
                Re: Functional programming Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-04 11:47 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 00:01 +1100
                OT Sine Rule [was Re: Functional programming] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-04 14:25 +0000
                Re: OT Sine Rule [was Re: Functional programming] Tim Chase <python.list@tim.thechases.com> - 2014-03-04 08:37 -0600
                Re: OT Sine Rule [was Re: Functional programming] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-04 14:42 +0000
                Re: OT Sine Rule [was Re: Functional programming] Chris Angelico <rosuav@gmail.com> - 2014-03-05 02:06 +1100
                Re: OT Sine Rule [was Re: Functional programming] Tim Chase <python.list@tim.thechases.com> - 2014-03-04 09:21 -0600
                Re: Functional programming Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2014-03-05 09:59 +0100
                Re: Functional programming Marko Rauhamaa <marko@pacujo.net> - 2014-03-04 21:49 +0200
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 07:01 +1100
                Re: Functional programming Marko Rauhamaa <marko@pacujo.net> - 2014-03-04 22:50 +0200
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 08:06 +1100
                Re: Functional programming Marko Rauhamaa <marko@pacujo.net> - 2014-03-04 23:21 +0200
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 08:26 +1100
                Re: Functional programming Marko Rauhamaa <marko@pacujo.net> - 2014-03-04 23:43 +0200
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 08:52 +1100
                Re: Functional programming Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-03-05 12:57 +1300
                Re: Functional programming Marko Rauhamaa <marko@pacujo.net> - 2014-03-05 02:11 +0200
                Re: Functional programming "BartC" <bc@freeuk.com> - 2014-03-04 13:30 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 00:47 +1100
                Re: Functional programming Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-04 14:05 +0000
                Re: Functional programming Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-04 14:55 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 02:13 +1100
                Re: Functional programming MRAB <python@mrabarnett.plus.com> - 2014-03-04 17:07 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 01:17 +1100
                Re: Functional programming Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-04 15:18 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 02:28 +1100
                Re: Functional programming Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-04 15:45 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 03:04 +1100
                Re: Functional programming Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2014-03-05 10:09 +0100
                Re: Functional programming "BartC" <bc@freeuk.com> - 2014-03-05 11:28 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-05 23:04 +1100
                Re: Functional programming Marko Rauhamaa <marko@pacujo.net> - 2014-03-05 14:11 +0200
                Re: Functional programming Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-03-04 11:06 +1300
                Re: Functional programming Ben Finney <ben+python@benfinney.id.au> - 2014-03-04 09:31 +1100
                Re: Functional programming Grant Edwards <invalid@invalid.invalid> - 2014-03-04 14:59 +0000
                Re: Functional programming Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-04 15:22 +0000
                Re: Functional programming Chris Angelico <rosuav@gmail.com> - 2014-03-04 09:42 +1100
                Re: Functional programming Ben Finney <ben+python@benfinney.id.au> - 2014-03-04 10:52 +1100
                Re: Functional programming "BartC" <bc@freeuk.com> - 2014-03-04 09:41 +0000
            Re: Functional programming 88888 Dihedral <dihedral88888@gmail.com> - 2014-03-03 16:35 -0800

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