C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  erf() / erfc() function under Visual C++ 6          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message simone Guest Posted: Fri Nov 19, 2004 2:53 pm    Post subject: erf() / erfc() function under Visual C++ 6 Hello everybody. I'm need to include the mathematical function erf and erfc in my code under Visual C++. I don't found them in the math.h provided by Visual C++, while I'm sure that the ANSI standard math.h have these function. How could I tackle this lack?? Thanks in advance Simone [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Thomas Richter Guest Posted: Fri Nov 19, 2004 4:48 pm    Post subject: Re: erf() / erfc() function under Visual C++ 6 Hi, Quote: I'm need to include the mathematical function erf and erfc in my code under Visual C++. I don't found them in the math.h provided by Visual C++, while I'm sure that the ANSI standard math.h have these function. How could I tackle this lack?? Check for the GNU scientific library, it contains also the error function and lots more: http://www.gnu.org/software/gsl/ So long, Thomas [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Victor Bazarov Guest Posted: Sat Nov 20, 2004 10:36 am    Post subject: Re: erf() / erfc() function under Visual C++ 6 simone wrote: Quote: I'm need to include the mathematical function erf and erfc in my code under Visual C++. I don't found them in the math.h provided by Visual C++, while I'm sure that the ANSI standard math.h have these function. What exactly makes you so sure? C99 added those functions, but C++ is not based on C99. C++ is based on C90, which does not define 'erf' or 'erfc'. Quote: How could I tackle this lack?? You could add your own header that will declare those functions (like they are declared in C99's <math.h>) and then make sure you link with a new implemenation of C99's math library, but you _can_ be running into some problems while doing that since the C90 run-time will be also linked in, most likely. I recommend finding the source for those functions, compile (assemble) them separately, and add as an object file[s] to your program. V [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top TOM Guest Posted: Sun Nov 21, 2004 3:15 am    Post subject: Re: erf() / erfc() function under Visual C++ 6 Be sure to test erfc() pretty carefully - many implementations are not accurate when the argument is greater than or equal to +6. For example MS Excel (probably due to single precision). erfc() can and should return values like 10^-17 for values of the argument near 6. -- Tom "simone" <simogasp (AT) tin (DOT) it> wrote Quote: Hello everybody. I'm need to include the mathematical function erf and erfc in my code under Visual C++. I don't found them in the math.h provided by Visual C++, while I'm sure that the ANSI standard math.h have these function. How could I tackle this lack?? [excess quoting deleted -- mod] [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ Language (Moderated) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.