MSFT and random numbers

[Howard Kaikow]

Anybody know whether MSFT has published the algorithm(s) used for the
following:

1. Randomize and Rnd in VB 6.
2. Randomize and Rnd in VB .NET
3. Random class in .NET.

 

[Herfried K. Wagner [MVP]]

Howard,

Anybody know whether MSFT has published the algorithm(s) used for the
following:

1. Randomize and Rnd in VB 6.
2. Randomize and Rnd in VB .NET
3. Random class in .NET.

I don't think so, but maybe you will find the implementation of the
latter here:

Shared Source CLI:

<http://msdn.microsoft.com/net/sscli/>
<http://msdn.microsoft.com/library/en-us/dndotnet/html/mssharsourcecli.asp>
<http://msdn.microsoft.com/library/en-us/dndotnet/html/mssharsourcecli2.asp>

 

[Mattias Sjögren]

Howard,

3. Random class in .NET.
http://sharedsourcecli.sscli.net/source/browse/sharedsourcecli/clr/src/bcl/system/random.cs


2. Randomize and Rnd in VB .NET

Not that I know, but you may be able to disassemble the VB library and
figure it out that way.

1. Randomize and Rnd in VB 6.

The VB.NET version is compatible with the VB6 version IIRC, so if you
get #2 you have this one as well.



Mattias

 

[Scott M.]

FYI - Randomize() and Rnd() are the same in VB 6.0 and VB.NET. In VB.NET
they are legacy functions.

 

[Howard Kaikow]

Thanx, downloading as we speak.

 

[Howard Kaikow]

THanx.

A number of folkes have raised questions about the quality of some of the
algorithms in Numerical Recipes in C, hope the random number algorithm is
not one of those.

There may be a paper on this at http://math.jpl.nasa.gov/nr/, but I cannot
seem to get to http://math.jpl.nasa.gov/ today.

 

[Jay B. Harlow [MVP - Outlook]]

Howard,
I vaguely remember something about Randomize & Rnd in MSDN Magazine or MSJ
magazine, however I don't have a specific link. Of course it may have been
VBPJ...

Of course this would have been from 3+ years ago, so I could be mistaken...

Hope this helps
Jay

 

[Howard Kaikow]

Thanx.

It is probably a hopeless quest.

Even if I were to find the algorithms for both Rnd and Random, the
mathematics of trying to determine what seeds would be need to start both
with the same value might be daunting.

--
http://www.standards.com/; See Howard Kaikow's web site.

Howard,
I vaguely remember something about Randomize & Rnd in MSDN Magazine or MSJ
magazine, however I don't have a specific link. Of course it may have been
VBPJ...

Of course this would have been from 3+ years ago, so I could be mistaken...

Hope this helps
Jay