The correct choice for implementation
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From: Erik Winkels on 10 Mar 2010 03:14 On 2010-03-10, Vassil Nikolov <vnikolov(a)pobox.com> wrote: > > Out of curiousity, what is the value of (/ (LOG -1) (SQRT -1)) in > CCL? Welcome to Clozure Common Lisp Version 1.4-dev-r12681M-trunk (LinuxX8632)! ? (/ (log -1) (sqrt -1)) #C(3.1415927 0.0)
From: Thomas A. Russ on 10 Mar 2010 14:06 Erik Winkels <aerique(a)xs4all.nl> writes: > On 2010-03-10, Vassil Nikolov <vnikolov(a)pobox.com> wrote: > > > > Out of curiousity, what is the value of (/ (LOG -1) (SQRT -1)) in > > CCL? > > Welcome to Clozure Common Lisp Version 1.4-dev-r12681M-trunk (LinuxX8632)! > ? (/ (log -1) (sqrt -1)) > #C(3.1415927 0.0) Which is exactly what I also get from CLISP. Is there some other answer that you are looking for? -- Thomas A. Russ, USC/Information Sciences Institute
From: Vassil Nikolov on 10 Mar 2010 22:45 On 10 Mar 2010 11:06:23 -0800, tar(a)sevak.isi.edu (Thomas A. Russ) said: > Erik Winkels <aerique(a)xs4all.nl> writes: >> On 2010-03-10, Vassil Nikolov <vnikolov(a)pobox.com> wrote: >> > Out of curiousity, what is the value of (/ (LOG -1) (SQRT -1)) in >> > CCL? >> >> Welcome to Clozure Common Lisp Version 1.4-dev-r12681M-trunk (LinuxX8632)! >> ? (/ (log -1) (sqrt -1)) >> #C(3.1415927 0.0) > Which is exactly what I also get from CLISP. Hmmmmmmmmmmmmmmmm................ I get 3.1415927 [*]. This feature, as well as things like arbitrary-precision long-floats, make me admire the quality of the results from numeric computations one can obtain with CLISP. _________ [*] cf. CLHS 12.1.3.3 Rule of Float Substitutability, the last sentence of the second paragraph; (/ (log -1.0) (sqrt -1.0)) => #C(3.1415927 0.0) as required ---Vassil. -- No flies need shaving.
From: Thomas A. Russ on 11 Mar 2010 12:00 Vassil Nikolov <vnikolov(a)pobox.com> writes: > On 10 Mar 2010 11:06:23 -0800, tar(a)sevak.isi.edu (Thomas A. Russ) said: > > > Erik Winkels <aerique(a)xs4all.nl> writes: > >> Welcome to Clozure Common Lisp Version 1.4-dev-r12681M-trunk (LinuxX8632)! > >> ? (/ (log -1) (sqrt -1)) > >> #C(3.1415927 0.0) > > > Which is exactly what I also get from CLISP. > > Hmmmmmmmmmmmmmmmm................ > > I get 3.1415927 [*]. How odd. I get the complex result running CLISP 2.48 on Mac/Leopard. This happens regardless of whether I start clisp with the -ansi or -traditional flag (although in both cases :ANSI-CL is on the *features* list, so I'm not fully confident that -traditional does anything). > This feature, as well as things like > arbitrary-precision long-floats, make me admire the quality of the > results from numeric computations one can obtain with CLISP. -- Thomas A. Russ, USC/Information Sciences Institute
From: Vassil Nikolov on 11 Mar 2010 22:35
On 11 Mar 2010 09:00:00 -0800, tar(a)sevak.isi.edu (Thomas A. Russ) said: > Vassil Nikolov <vnikolov(a)pobox.com> writes: >> ... >> I get 3.1415927 [*]. > How odd. I get the complex result running CLISP 2.48 on Mac/Leopard. I am quite baffled. (That does not mean I might not be blind to the obvious at the same time...) ---Vassil. -- No flies need shaving. |