* Differances in Ada and C++ on Sin and Cos @ 2005-04-13 11:50 ich_bin_elvis 2005-04-13 13:12 ` Marius Amado Alves ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: ich_bin_elvis @ 2005-04-13 11:50 UTC (permalink / raw) Hi, Does ada and C++ treat Cos and Sin functions different? I know arctan and atan behaves different. But it seams like there is an different behavior on the same program code written in ada and C++ on cos and sin also. is there other functions that behaves deifferent that I should be aware of? Regards Ronny ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Differances in Ada and C++ on Sin and Cos 2005-04-13 11:50 Differances in Ada and C++ on Sin and Cos ich_bin_elvis @ 2005-04-13 13:12 ` Marius Amado Alves 2005-04-13 13:57 ` Dmitry A. Kazakov 2005-04-13 19:42 ` Jeffrey Carter 2 siblings, 0 replies; 4+ messages in thread From: Marius Amado Alves @ 2005-04-13 13:12 UTC (permalink / raw) To: ich_bin_elvis; +Cc: comp.lang.ada > Does ada and C++ treat Cos and Sin functions different? I know arctan > and atan behaves different. But it seams like there is an different > behavior on the same program code written in ada and C++ on cos and sin > also. I'd be very surprised--and frightened--if the differences were not in precision only. ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Differances in Ada and C++ on Sin and Cos 2005-04-13 11:50 Differances in Ada and C++ on Sin and Cos ich_bin_elvis 2005-04-13 13:12 ` Marius Amado Alves @ 2005-04-13 13:57 ` Dmitry A. Kazakov 2005-04-13 19:42 ` Jeffrey Carter 2 siblings, 0 replies; 4+ messages in thread From: Dmitry A. Kazakov @ 2005-04-13 13:57 UTC (permalink / raw) On 13 Apr 2005 04:50:07 -0700, ich_bin_elvis@hotmail.com wrote: > Does ada and C++ treat Cos and Sin functions different? In Ada there are two variants of Cos/Sin, one of them has the argument specified in terms of cycle, which may differ from the standard mathematical definition (e.g. 2 Pi.) Do you mean this? -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Differances in Ada and C++ on Sin and Cos 2005-04-13 11:50 Differances in Ada and C++ on Sin and Cos ich_bin_elvis 2005-04-13 13:12 ` Marius Amado Alves 2005-04-13 13:57 ` Dmitry A. Kazakov @ 2005-04-13 19:42 ` Jeffrey Carter 2 siblings, 0 replies; 4+ messages in thread From: Jeffrey Carter @ 2005-04-13 19:42 UTC (permalink / raw) ich_bin_elvis@hotmail.com wrote: > Does ada and C++ treat Cos and Sin functions different? I know arctan > and atan behaves different. But it seams like there is an different > behavior on the same program code written in ada and C++ on cos and sin > also. is there other functions that behaves deifferent that I should > be aware of? Ada generally requires greater accuracy from the elementary functions than other languages. ARM A.5.1 says "The results of the Sin, Cos, Tan, and Cot functions with specified cycle are exact when the mathematical result is zero; those of the first two are also exact when the mathematical result is � 1.0." A compiler that implements the Numerics Annex will also abide by the accuracy requirements of ARM G.2.4 (at least in strict mode, which may be the default mode; see ARM G.2). These can be difficult to read sometimes. I find "The maximum relative error exhibited by each function is as follows: 2.0 � EF.Float_Type'Model_Epsilon, in the case of the Sqrt, Sin, and Cos functions" "The absolute value of the result of the Sin, Cos, and Tanh functions never exceeds one." specific to Sin and Cos. Note that for GNAT 3.15p, which completely implements the Numerics Annex, strict mode is the default and only mode for the elementary functions. This is probably true for later versions of GNAT as well. -- Jeff Carter "Apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, the fresh water system, and public health, what have the Romans ever done for us?" Monty Python's Life of Brian 80 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-04-13 19:42 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-04-13 11:50 Differances in Ada and C++ on Sin and Cos ich_bin_elvis 2005-04-13 13:12 ` Marius Amado Alves 2005-04-13 13:57 ` Dmitry A. Kazakov 2005-04-13 19:42 ` Jeffrey Carter
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