C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Normal distribution enhacements in C++ technical report          C++Talk.NET Forum Index -> C++ language, library and standards View previous topic :: View next topic   Author Message apm Guest Posted: Fri May 14, 2004 12:08 am    Post subject: Normal distribution enhacements in C++ technical report Has anyone looked at the C++ technical report concerned with proposed additions to the language? There is a tonne of stuff in there including hash containers, various maths routine, random number generation etc. There is also mention of stuff to support normal distributions. However, unless there is something wrong with my maths the TR describes a gaussian distribution rather than a normal distribution. AFAIK, the later is the formal that has been adjusted to have a mean of zero and a std deviation of unity. Perhaps the TR need correcting? Regards, Andrew Marlow --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ] Back to top Pete Becker Guest Posted: Fri May 14, 2004 2:20 am    Post subject: Re: Normal distribution enhacements in C++ technical report apm wrote: Quote: Has anyone looked at the C++ technical report concerned with proposed additions to the language? There is a tonne of stuff in there including hash containers, various maths routine, random number generation etc. There is also mention of stuff to support normal distributions. However, unless there is something wrong with my maths the TR describes a gaussian distribution rather than a normal distribution. AFAIK, the later is the formal that has been adjusted to have a mean of zero and a std deviation of unity. Perhaps the TR need correcting? This is an area where names sometimes vary, but the name "normal distribution" as used in TR1 is also used the same way in other places. For example, see www.itl.nist.gov/div898/handbook/eda/section3/eda3661.htm, which calls that formula a "normal distribution" and says that the special case where the mean is 0 and the deviation is 1 is a "standard normal distribution." -- Pete Becker Dinkumware, Ltd. (http://www.dinkumware.com) --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ] Back to top Alberto Barbati Guest Posted: Fri May 14, 2004 3:02 pm    Post subject: Re: Normal distribution enhacements in C++ technical report Pete Becker wrote: Quote: This is an area where names sometimes vary, but the name "normal distribution" as used in TR1 is also used the same way in other places. For example, see www.itl.nist.gov/div898/handbook/eda/section3/eda3661.htm, which calls that formula a "normal distribution" and says that the special case where the mean is 0 and the deviation is 1 is a "standard normal distribution." Same terminology here: http://en.wikipedia.org/wiki/Normal_distribution where it's also said explicitly that "[The normal distribution] is also called the Gaussian distribution, especially in physics and engineering". Alberto --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ] Back to top apm Guest Posted: Fri May 14, 2004 10:51 pm    Post subject: Re: Normal distribution enhacements in C++ technical report [email]petebecker (AT) acm (DOT) org[/email] (Pete Becker) wrote in message news:<40A41351.E0D38D6D (AT) acm (DOT) org>... Quote: apm wrote: However, unless there is something wrong with my maths the TR describes a gaussian distribution rather than a normal distribution. AFAIK, the later is the formal that has been adjusted to have a mean of zero and a std deviation of unity. Perhaps the TR need correcting? This is an area where names sometimes vary, but the name "normal distribution" as used in TR1 is also used the same way in other places. For example, see www.itl.nist.gov/div898/handbook/eda/section3/eda3661.htm, which calls that formula a "normal distribution" and says that the special case where the mean is 0 and the deviation is 1 is a "standard normal distribution." I stand corrected. Thanks for the info! -Andrew M. --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ] Back to top Walter Tross Guest Posted: Sat May 15, 2004 3:09 am    Post subject: Re: Normal distribution enhacements in C++ technical report apm 2004-05-14 : Quote: Has anyone looked at the C++ technical report concerned with proposed additions to the language? There is a tonne of stuff in there including hash containers, various maths routine, random number generation etc. There is also mention of stuff to support normal distributions. However, unless there is something wrong with my maths the TR describes a gaussian distribution rather than a normal distribution. AFAIK, the later is the formal that has been adjusted to have a mean of zero and a std deviation of unity. Perhaps the TR need correcting? I don't have my math and physics books at hand right now, but perhaps it helps to know that in "Numerical Recipes in C++" (Press, Teukolsky, Vetterling, Flannery) the terms "Gaussian" and "normal" are used interchangeably? --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. 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