Re: Calculator Accuracy

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From	David Hume <David.Hume@example.com>
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Subject	Re: Calculator Accuracy
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Eric Pozharski <whynot@pozharski.name> writes:

> with <lkfom3$7ui$1@speranza.aioe.org> Hils wrote:
>
> *SKIP*
>> R version 3.1.0:
>>
>> asin(acos(atan(tan(cos(sin(45*pi/180))))))*180/pi-45
>> [1] -7.105427e-15
>>
>> Gnuplot 4.6:
>>
>> print asin(acos(atan(tan(cos(sin(45*pi/180))))))*180/pi-45
>> -7.105427357601e-15
>>
>> I'm guessing a common library at work here...
>
> libc, maybe:
>
> 	% perl -MMath::Trig -wle '
> 	print rad2deg( asin acos atan tan cos sin deg2rad 45 ) - 45'
> 	7.105427357601e-15
>

These aren't the same tests as having the calculator in degrees mode,
because in these tests when the result of sine is passed to cosine it is
treated as radians.

Thread

Calculator Accuracy Gordon Henderson <gordon+usenet@drogon.net> - 2014-05-08 07:00 +0000
  Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-08 08:39 +0100
  Re: Calculator Accuracy Andy Burns <usenet.feb2014@adslpipe.co.uk> - 2014-05-08 09:14 +0100
    Re: Calculator Accuracy Andy Burns <usenet.feb2014@adslpipe.co.uk> - 2014-05-12 19:02 +0100
  Re: Calculator Accuracy "BartC" <bc@freeuk.com> - 2014-05-08 09:43 +0100
    Re: Calculator Accuracy Tim Streater <timstreater@greenbee.net> - 2014-05-08 09:53 +0100
      Re: Calculator Accuracy "BartC" <bc@freeuk.com> - 2014-05-08 10:22 +0100
        Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-08 12:17 +0100
          Re: Calculator Accuracy RS Wood <rsw@therandymon.com> - 2014-05-08 14:09 +0000
            Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-08 16:04 +0100
            Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-08 16:49 +0000
              Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-09 00:03 +0000
            Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-09 00:10 +0000
              Re: Calculator Accuracy RS Wood <rsw@therandymon.com> - 2014-05-09 21:32 +0000
                Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-10 03:30 +0000
            Re: Calculator Accuracy "G. Paul Ziemba" <paul+usenet@w6yx.stanford.edu> - 2014-05-09 03:43 +0000
    Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-08 10:55 +0100
      Re: Calculator Accuracy "BartC" <bc@freeuk.com> - 2014-05-08 11:23 +0100
      Re: Calculator Accuracy Hils <hils@saynotospam.net> - 2014-05-08 12:09 +0100
        Re: Calculator Accuracy Hils <hils@saynotospam.net> - 2014-05-08 23:02 +0100
          Re: Calculator Accuracy Marc Auslander <marcslists@gmail.NOSPAM.com> - 2014-05-08 19:51 -0400
            Re: Calculator Accuracy Will Honea <whonea@whonea.net> - 2014-05-08 18:19 -0600
        Re: Calculator Accuracy Eric Pozharski <whynot@pozharski.name> - 2014-05-09 15:19 +0300
          Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-09 19:06 +0100
            Re: Calculator Accuracy Eric Pozharski <whynot@pozharski.name> - 2014-05-10 08:38 +0300
              Re: Calculator Accuracy Eric Pozharski <whynot@pozharski.name> - 2014-05-12 09:30 +0300
          Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-10 00:00 +0100
      Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-08 11:40 +0000
  Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-08 11:32 +0000
  Re: Calculator Accuracy Anssi Saari <as@sci.fi> - 2014-05-08 20:20 +0300
    Re: Calculator Accuracy Gordon Henderson <gordon+usenet@drogon.net> - 2014-05-08 17:40 +0000
      Re: Calculator Accuracy David Hume <David.Hume@example.com> - 2014-05-09 08:43 +0100
        Re: Calculator Accuracy Rich <rich@example.com> - 2014-05-09 10:42 +0000
        Re: Calculator Accuracy Whiskers <catwheezel@operamail.com> - 2014-05-09 21:56 +0100
      Re: Calculator Accuracy Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2014-05-12 13:50 +0100
  Re: Calculator Accuracy Caecilius <nospam@spamless.invalid> - 2014-05-08 19:34 +0100
  Re: Calculator Accuracy Caecilius <nospam@spamless.invalid> - 2014-05-08 19:38 +0100
    Re: Calculator Accuracy Hils <hils@saynotospam.net> - 2014-05-08 22:06 +0100
  Re: Calculator Accuracy Paul Sture <nospam@sture.ch> - 2014-05-10 21:24 +0200
  Re: Calculator Accuracy Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-05-11 16:22 +0000
    Re: Calculator Accuracy Will Honea <whonea@whonea.net> - 2014-05-11 15:41 -0600
      Re: Calculator Accuracy Tim Streater <timstreater@greenbee.net> - 2014-05-11 23:02 +0100
  Re: Calculator Accuracy David Harmon <source@netcom.com> - 2014-05-12 18:20 -0700
  Re: Calculator Accuracy Yeechang Lee <ylee@pobox.com> - 2014-07-25 20:26 -0700

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