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Vijay,
Flipping a coin has a probability of .5. Its either the head or the tails.
But when you have to choose a number out of a set of 10^8 integers,
getting the same number again within a span of say 1 trials seems
ridiculous.
A few minutes in Excel tells me there is only a 60% chance of n
Here is a layman's explanation of this phenomenon:
http://www.cut-the-knot.org/do_you_know/coincidence.shtml
Again, I would caution against applying brute-force engineering
solutions (hashtables of numbers). While human intuition is often very
powerful, it can be extremely misleading when statist
got it!
http://www.hanselman.com/blog/PermaLink.aspx?guid=4d0ef4fb-f8ae-4355-a658-3c0432c98dbe
for v1.1 only it seems:
http://weblogs.asp.net/jgalloway/archive/2003/10/28/34343.aspx
jon
--- jon <[EMAIL PROTECTED]> wrote:
> Hello again,
>
> We have an ASP application with many
> sub-applicatio
Chad,
I ran the program and it does give me 997, 995, 953 repeated values on 3
successive runs. I have a similar check written down as part of my test
suite and the statistics of repetition does seem to be high.
But why not recalculate the random number if it repeats ?! Well to check
whether it r
Random numbers are expected to repeat. It would be decidedly unrandom if
they did not. Flip a coin for a few moments and you'll find out that you
see many streaks of heads and tails. While it would take some time to
determine whether the 900+ duplicates was more or less than expected out
of 2 milli
Hello again,
We have an ASP application with many sub-applications.
One of the sub-applications is to be converted to
ASP.Net. Now we have made it work by moving the bin/
directory and web.config of the sample asp.net project
in the application root. We were wondering if it is
possible to keep the
First off I want to mention that it was a long day today and that "299"
comment I made was something I remembered from a while back. It was
really the limitation of the Console window for displaying my dups :-).
Anyway, here is a little code snippet to show how the Random class
duplicates in .NET:
If you've been testing using seed X and have hit a bug / issue / bit of
unfinished code based on the sequence of (pseudo-random) values returned by
your generator, you want to be able to modify the code and re-run with the same
seed, knowing that you'll get to that same point in your code.
Once
Reed,
Thanks a lot for sharing your thoughts ! Some of the things you said about
the seed selection seemed weird the first time but then after some thought,
makes sense.
So now, are you saying that i use the same seed for my final calculations
once i find the results of the test runs to be satisf
What is this, the Heisenberg uncertainty principal list or what?
Fundamentally a computer cannot generate a random number where there's
deliberate programming involved IMO. It's a contradiction in terms.
Dan
-Original Message-
From: Vijay M [mailto:[EMAIL PROTECTED]
Sent: Thursday, Novem
Andrew,
You miss the point. The world is purely random by all means but once you
try to detect it, the error of measurement is definite and produces a
standard variance in the resulting data. Hence anything measured, simply
cannot be random. My 2 cents on the subject. If you feel like thinking
mor
-Original Message-
From: Unmoderated discussion of advanced .NET topics.
[mailto:[EMAIL PROTECTED] On Behalf Of Kristoffer
Sheather
Sent: Wednesday, November 10, 2004 9:11 PM
To: [EMAIL PROTECTED]
Subject: Re: [ADVANCED-DOTNET] Random number generation.
Is a random number calculated by kno
Based on my own experiences with random number generators, the two main
items you need to look at are the initial seed and the period of the
generator. A RNG is usually designed to recreate the same sequence over
and over given the same seed value. The key is that the sequence of
numbers do not r
>>I would not use the .NET Random for sure. You indicated you want values
>>honest out to 30 Million, the .NET framework Random is not going to give
>>it to you.
The SSCLI source seems to be Knuth's Ran3 algorithm. According to
http://www.shadlen.org/ichbin/random/generators.htm, that algorithm h
On Thu, 11 Nov 2004 15:05:08 -0500, Chad M. Gross
<[EMAIL PROTECTED]> wrote:
> As for the RNGCryptoServiceProvider sample someone sent off to you, that
> may work for you but you need to make a change to the code to use a byte
> [8] and an Int64 to get more randomness and minimize repetition.
Good
Fabian,
I found out that the Mersenne Twister algorithm seems to be widely used to
create pseudo-random numbers of high volume in lots of places. Been reading
on it from the morning and seems promising !
There is also a port of the algorithm written by Trevor Misfeldt in C#.
http://www.c-sharpcor
I would not use the .NET Random for sure. You indicated you want values
honest out to 30 Million, the .NET framework Random is not going to give
it to you. My guess when you say "true to 30 Million", you mean random
numbers generated from a non-repeatable number sequence that has a period
of at l
Larry,
The first thing i did before posting the message here was to check out the
source code in SSCLI on how the Random class has been implemented. But even
after that, i still wasn't sure on how good it might perform for very huge
numbers that i am dealing with.
It is one thing to work well for
Dominick, Thanks for site link .. Looks pretty neat. Havent looked at the
code though. But involves quite a few perl source to get the job done. Not
sure whether it would be feasible to port this to .NET for getting what i
want. Thanks anyway :)
And Jason, radioactive decay is not exactly random.
Steve,
Half-million random numbers is good news ! I havent really tried this class
yet for any of my purposes but i guess it might be useful.
Will let you know by end of day on how this works out. Thanks.
>On Wed, 10 Nov 2004 21:34:10 -0700, Steve Johnson <[EMAIL PROTECTED]>
wrote:
>> The follow
Excellent discussion, everyone! Incidentally, I've been looking for a
Monte Carlo example/kickstart for a while, and recently found
Math.NET[0] which made it to version 2.0 last month. I haven't had a
chance to dig in to the code, but it has several pseudo-random
generators based on Numerical Recip
> How can I make Type.GetType("SqlException") work?
> I have tried
> "System.Data.SqlClient.SqlException,System.Data" and
> "System.Data.SqlClient.SqlException,System.Data.dll"
> and it doesn't work.
What does 'doesn't work' mean? Exception? No type? dull error?
System.Data.dll should wo
Thanks to both of you, got it!
jon
--- Richard Blewett <[EMAIL PROTECTED]> wrote:
> Type.GetType("System.Data.SqlClient.SqlException,
> System.Data,
> Version=1.0.5000.0, Culture=neutral,
> PublicKeyToken=b77a5c561934e089" );
>
> In other words you have to specify both the fully
> qualified type
You need something like:
System.Data.SqlClient.SqlException, System.Data, Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089
The reason for this is that there could be multiple System.Data
assemblies in the GAC, e.g. different versions.
--
Ivan Towlson
White Carbon
-Origi
Type.GetType("System.Data.SqlClient.SqlException, System.Data,
Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" );
In other words you have to specify both the fully qualified type name and
the fully qualified assembly name
Regards
Richard Blewett - DevelopMentor
http://www.d
A perfect random generator can never exist, ever ! Unfortunate but true !
But what i am looking for is a good pseudo random number generator in .NET
!
That's not strictly true, certain quantum phenomena are thought to be truly
random ( although there is some argument that that's just because we don
Hi
How can I make Type.GetType("SqlException") work?
I have tried
"System.Data.SqlClient.SqlException,System.Data" and
"System.Data.SqlClient.SqlException,System.Data.dll"
and it doesn't work. FWIW, I'm trying to use the
Exception Management Block from MS and I was thinking
to do something like
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