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From "Stephen Colebourne" <scolebou...@btopenworld.com>
Subject Re: [Lang] proposed math extensions
Date Tue, 06 May 2003 21:27:26 GMT
You might be right, but I know I couldn't contribute as I don't have the
expertise...

There is also the question of whether there is a good OSS maths component
already. http://dautelle.com/jade has some maths functionality - don't know
how much though.

Stephen

----- Original Message -----
From: "robert burrell donkin" <robertburrelldonkin@blueyonder.co.uk>
To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org>
Sent: Tuesday, May 06, 2003 10:11 PM
Subject: Re: [Lang] proposed math extensions


> it's sort of in-scope but i agree that it's something that could easily
> get out of hand. it sounds to me like there might be enough momentum for a
> separate maths component here in the commons.
>
> - robert
>
> On Tuesday, May 6, 2003, at 10:07 PM, Stephen Colebourne wrote:
>
> > In theory, much of this sounds useful. However the problem is where to
> > stop.
> > A maths library could grow and grow to be bigger than [lang] itself. So
> > care
> > must be taken.
> >
> > Some of the simpler addditions to RandomUtils sound fine. Reseeding,
extra
> > methods etc.
> >
> > I am less sure about the need for Gaussian, Exponential, Poisson,
> > Binomial,
> > Geometric, or HyperGeometric distribution random numbrs - I don't even
> > know
> > what most of these are. The solution may be to have a plugin style, that
> > can
> > generate numbers from Random, SecureRandom or any of the above
> > distributions.
> >
> > Computing  densities  and  statistitics  sounds out of scope for [lang]
to
> > me.
> >
> > Given this, perhaps you could discuss each item/submit small patches
with
> > test cases to gradually introduce those features that make sense.
> >
> > Stephen
> >
> > ----- Original Message -----
> > From: "Phil Steitz" <phil@steitz.com>
> > To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org>
> > Sent: Sunday, April 27, 2003 8:36 PM
> > Subject: [Lang] proposed math extensions
> >
> >
> >> I have code (and tests :-) for each of the following that I would be
> >> willing to contribute.  Is any of this appropriate for lang.math?
> >>
> >> 1. Generate random numbers from Gaussian, Exponential, Poisson,
> >> Binomial, Geometric, or HyperGeometric distributions.
> >> 2. Use SecureRandom to provide cryptographically secure random
sequences
> >> for each of the above, plus the stuff already in RandomUtils, plus
> >> secure random strings (useful for generating "unpredictable" session
id'
> >> s)
> >> 3. Compute binomial coeffiecients and binomial, geometric,
> >> hypergeometric densities
> >> 4. Generate univariate statistics or frequency distributions from input
> > data
> >>
> >> I could include the stuff in 1.as a patch to math.RandomUtils.  Not
sure
> >> where (if anywhere) the other things belong.
> >>
> >> I would also like to see math.RandomUtils modified to support the
> > following:
> >> a) reseeding the Random number generator. I could submit a patch to do
> >> this by adding a static Random to use in generating the uniform
variates
> >> in place of math.random().
> >> b) add nextInt(min,max) (inclusive) and/or nextInt(IntRange r)
> >> I could submit a patch for this small extension as well.
> >>
> >> Phil
> >>
> >>
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> >>
> >
> >
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> >
>
>
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