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

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apm wrote:
>
> 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)

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Pete Becker wrote:
>
> 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

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petebecker@acm.org (Pete Becker) wrote in message news:<40A41351.E0D38D6D@acm.org>...
> 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.

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apm 2004-05-14 :

> 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?

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