Re: C-Programming

From	jacob navia <jacob@spamsink.net>
Newsgroups	comp.lang.c
Subject	Re: C-Programming
Date	2014-12-19 20:42 +0100
Organization	lccwin
Message-ID	<m71v2r$dgu$1@speranza.aioe.org> (permalink)
References	(1 earlier) <chine.bleu-7CBF22.01345019122014@news.eternal-september.org> <UXSkw.145485$5z5.35816@fx42.am4> <m71kh7$g7q$1@speranza.aioe.org> <m71sk8$s3s$1@news.albasani.net> <m71ueb$bvg$1@speranza.aioe.org>

Show all headers | View raw

Le 19/12/2014 20:31, jacob navia a écrit :
> Le 19/12/2014 20:00, none Rouben Rostamian a écrit :
>> Beware, however, that your definition will be in conflict with
>> the C99 standard's tgamma() function whose definition agrees
>> with the mathematical definition of the Gamma function.
>
> Surely not!
>
> The standard says:
>
> 7.12.8.4 The tgamma functions
> Synopsis
> 1 #include <math.h>
> double tgamma(double x);
> float tgammaf(float x);
> long double tgammal(long double x);
> Description
> 2 The tgamma functions compute the gamma function of x. A domain error
> or pole error may occur if x is a negative integer or zero.
>
> Read with me:
>
> MAY occur!
>
> Maybe not. This standard is so worded that you can do anything with it!
>
> So, if I define the tgamma function for negative integers as specified
> in that paper I am still standard conforming.
>
> Besides, if the user gives negative numbers it is because he wants the
> definition specified in that paper. The standard  doesn't even specify
> the error return!


P.S. The negative factorial is defined as

factorial(-n) --> factorial(n)*((n&1)?-1:1)

fact(-1) --> -1
fact(-2) -->  2
fact(-3) --> -6
fact(-4) --> 24
fact(-5) --> -120

I.e. is negative if n is odd, positive otherwise.

Thread

C-Programming arvindgupta01031988@gmail.com - 2014-12-06 11:09 -0800
  Re: C-Programming "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2014-12-06 11:16 -0800
  Re: C-Programming James Kuyper <jameskuyper@verizon.net> - 2014-12-06 14:46 -0500
    Re: C-Programming Kleuske <kleuske@nowhere.net> - 2014-12-07 10:48 +0000
      Re: C-Programming Keith Thompson <kst-u@mib.org> - 2014-12-07 07:43 -0800
  Re: C-Programming Siri Crews <chine.bleu@yahoo.com> - 2014-12-06 12:22 -0800
    Re: C-Programming gordonb.ukogy@burditt.org (Gordon Burditt) - 2014-12-19 03:29 -0600
      Re: C-Programming Siri Crews <chine.bleu@yahoo.com> - 2014-12-19 01:34 -0800
        Re: C-Programming Richard Heathfield <invalid@see.sig.invalid> - 2014-12-19 10:18 +0000
          Re: C-Programming jacob navia <jacob@spamsink.net> - 2014-12-19 17:42 +0100
            Re: C-Programming rouben@shadow.(none) (Rouben Rostamian) - 2014-12-19 19:00 +0000
              Re: C-Programming jacob navia <jacob@spamsink.net> - 2014-12-19 20:31 +0100
                Re: C-Programming jacob navia <jacob@spamsink.net> - 2014-12-19 20:42 +0100
              Re: C-Programming Keith Thompson <kst-u@mib.org> - 2014-12-19 11:54 -0800
        Re: C-Programming raltbos@xs4all.nl (Richard Bos) - 2014-12-19 11:29 +0000
          Re: C-Programming Noob <root@127.0.0.1> - 2014-12-20 10:22 +0100
            Re: C-Programming Keith Thompson <kst-u@mib.org> - 2014-12-20 11:48 -0800
        Re: C-Programming Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-19 03:33 -0800
          Re: C-Programming Siri Crews <chine.bleu@yahoo.com> - 2014-12-19 04:02 -0800
      Re: C-Programming glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-12-19 17:28 +0000
  Re: C-Programming jacob navia <jacob@spamsink.net> - 2014-12-06 21:27 +0100
  Re: C-Programming Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-12-07 13:07 +0000
  Re: C-Programming David Brown <david.brown@hesbynett.no> - 2014-12-08 01:24 +0100
    Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-16 04:44 -0800
      Re: C-Programming David Brown <david.brown@hesbynett.no> - 2014-12-16 15:02 +0100
        Re: C-Programming BartC <bc@freeuk.com> - 2014-12-16 18:27 +0000
          Re: C-Programming David Brown <david.brown@hesbynett.no> - 2014-12-17 01:01 +0100
            Re: C-Programming BartC <bc@freeuk.com> - 2014-12-17 00:23 +0000
        Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-16 16:30 -0800
          Re: C-Programming David Brown <david.brown@hesbynett.no> - 2014-12-17 02:18 +0100
            Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-16 18:23 -0800
              Re: C-Programming David Brown <david.brown@hesbynett.no> - 2014-12-17 09:59 +0100
                Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-17 08:52 -0800
                Re: C-Programming David Brown <david.brown@hesbynett.no> - 2014-12-18 11:11 +0100
                Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-18 09:49 -0800
          Re: C-Programming JohnF <john@please.see.sig.for.email.com> - 2014-12-17 10:14 +0000
            Re: C-Programming Richard Heathfield <invalid@see.sig.invalid> - 2014-12-17 14:26 +0000
              Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-17 09:13 -0800
                Re: C-Programming Richard Heathfield <invalid@see.sig.invalid> - 2014-12-17 17:34 +0000
                Re: C-Programming Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-17 23:26 -0800
                Re: C-Programming Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-18 00:21 -0800
                Re: C-Programming Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-12-18 17:06 +0000
                Re: C-Programming Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-18 09:29 -0800
                Re: C-Programming Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-12-19 02:36 +0000
                Re: C-Programming Malcolm McLean <malcolm.mclean5@btinternet.com> - 2014-12-19 03:41 -0800
                Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-18 08:52 -0800
              Re: C-Programming Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-12-17 23:23 +0000
                Re: C-Programming BartC <bc@freeuk.com> - 2014-12-18 00:02 +0000
                Re: C-Programming Richard Heathfield <invalid@see.sig.invalid> - 2014-12-18 00:15 +0000
                Re: C-Programming Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-12-18 16:37 +0000
                Re: C-Programming Richard Heathfield <invalid@see.sig.invalid> - 2014-12-18 18:08 +0000
                Re: C-Programming Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-12-19 02:40 +0000
                Re: C-Programming Richard Heathfield <invalid@see.sig.invalid> - 2014-12-19 07:51 +0000
            Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-17 09:07 -0800
              Re: C-Programming JohnF <john@please.see.sig.for.email.com> - 2014-12-19 04:22 +0000
                Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-19 09:22 -0800
                Re: C-Programming Greg Martin <greg.at.softsprocket@dot.com> - 2014-12-20 02:39 +0000
                Re: C-Programming JohnF <john@please.see.sig.for.email.com> - 2014-12-20 06:57 +0000
  Re: C-Programming Tim Rentsch <txr@alumni.caltech.edu> - 2014-12-15 23:53 -0800

csiph-web