*From*: zentara <zentara1 sbcglobal net>*To*: gtk-list gnome org*Subject*: Re: Getting greatest decimal accuracy out of G_PI*Date*: Sat, 3 Feb 2007 07:09:17 -0500

On Sat, 3 Feb 2007 13:31:57 +0200 Tor Lillqvist <tml iki fi> wrote: > > Just feeling for the limits of what I can do given the contraints > > of the language. > >And how is that related to GTK+? Well Gtk+ is based on Glib. The Glib header defined the accuracy of G_PI to 50 decimal places. Isn't it a fair question to enquire whether the extra functionality provided by GLib, somehow allows us to use it? I don't see a Glib maillist anywhere. > > I like to think about things like using the center of the earth as > > an origin, and using a spherical coordinate system to locate > > points(and/or areas volumes) on the surface or in space. The accuracy > > depends mostly on the accuracy of the angles in radians( ie. the > > number of decimal places of PI). > >What about the accuracy of the measurements that specify where said >points are in the first place? What about the accuracy of the >trigonometric function implementations? What about the accuracy and >stability (etc, stuff I don't really know) of the algorithms you use? >You do know, I hope, that for instance (hypothetically) adding a 20 >digit "accurate" 1.0000000000000000000 to an equally accurate >1.0000000000000000000e-6 a million times isn't necessarily going to >produce what you perhaps expect. > > > I'm sure it can go into the other direction also, what about nano-technology > > where you are dealing with the super-small. The ability to distinquish > > very small angles would be very important. > >Sorry, but I do get the feeling that this is one of the discussions >where the somewhat blunt but most appropriate answer is "if you have >to ask that question (on an off-topic mailing list, even), you >shouldn't be doing it". >--tml Sorry if I bothered you, by raising the topic. zentara -- I'm not really a human, but I play one on earth. http://zentara.net/japh.html

**References**:**Re: Getting greatest decimal accuracy out of G_PI***From:*David =?iso-8859-2?B?TmXoYXMgKFlldGkp?=

**Re: Getting greatest decimal accuracy out of G_PI***From:*Sergei Steshenko

**Re: Getting greatest decimal accuracy out of G_PI***From:*David =?iso-8859-2?B?TmXoYXMgKFlldGkp?=

**Re: Getting greatest decimal accuracy out of G_PI***From:*Tor Lillqvist

**Re: Getting greatest decimal accuracy out of G_PI***From:*zentara

**Re: Getting greatest decimal accuracy out of G_PI***From:*Tor Lillqvist

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