I want to make a schedule for many pastors. The conditions are: Every month, each pastor must must go to another church, The pastor must not go to same church where he came In 1 year he must go to 12 different churches There is 13 churches and 13 pastors and every church accepts only 1 pastor every month I can't use random(1 to 12) ...
Recently I needed to do weighted random selection of elements from a list, both with and without replacement. While there are well known and good algorithms for unweighted selection, and some for weighted selection without replacement (such as modifications of the resevoir algorithm), I couldn't find any good algorithms for weighted sele...
Lets say my alphabet contains X letters and my language supports only Y letter words (Y < X ofcourse). I need to generate all the words possible in random order. E.g. Alphabet=a,b,c,d,e,f,g Y=3 So the words would be: aaa aab aac aba .. bbb ccc .. (the above should be generated in random order) The trivial way to do it would be to gene...
I have a PRNG with nice properties which uses 6 UInt32s as state. I need to come up with a reasonable way to seed it. Two obvious possibilities are: 1) generate 6 random numbers using System.Random and use them as seeds; 2) generate 2 Guids with Guid.NewGuid(). Which would be better? I do not need cryptographic security. ...
Here is my query: Select Top 10 CS.CaseStudyID, CS.Title, CSI.ImageFileName From CaseStudy CS Left Join CaseStudyImage CSI On CS.CaseStudyID = CSI.CaseStudyID And CSI.CSImageID in( Select Min(CSImageID) -- >not really satisfactory From CaseStudyImage Group By CaseStudyID ) Order By CS.CaseStudyID ASC Instea...
I need to randomly 'sort' a list of integers (0-1999) in the most efficient way possible. Any ideas? Currently, I am doing something like this: bool[] bIndexSet = new bool[iItemCount]; for (int iCurIndex = 0; iCurIndex < iItemCount; iCurIndex++) { int iSwapIndex = random.Next(iItemCount); if (!bIndexSet[iSwapIndex] && iSwapIn...
This recent question about sorting randomly using C# got me thinking about the way I've sometimes shuffled my arrays in Perl. @shuffled = sort { rand() <=> rand() } @array; The proposed solution in the mentioned question is Fisher-Yates shuffle, which works in a linear time. The question is: how efficient is my snippet and is such sh...
i've god a simple piece of code: public string GenerateRandomString() { string randomString = string.Empty; Random r = new Random(); for (int i = 0; i < length; i++) randomString += chars[r.Next(chars.Length)]; return randomString; } If i call this functi...
How do we combine http://stackoverflow.com/questions/19412/how-to-request-a-random-row-in-sql and http://stackoverflow.com/questions/183124/multiple-random-values-in-sql-server-2005 to select N random rows using a single pure-SQL query? Ideally, I'd like to avoid the use of stored procedures if possible. Is this even possible? CLARIFICA...
My design exposes two kinds of resources: Images Tags I would like clients to be able to request random images by their tag(s). For example: Give me random images that are tagged with "New York" and "Winter". What would a RESTful design look like in this case? ...
I'm trying to generate random permutations of an 80-character fixed string in C. Much to my dismay, the system I'm working on lacks strfry(). What's the best way for me to generate a random permutation of this string? Since this will be looped over approx. 100,000 times, performance is an issue. ...
Hi, I am looking to develop a system in which i need to assign every user a unique pin code for security. The user will only enter this pin code as a means of identifying himself. Thus i dont want the user to be able to guess another users pincode. Assuming the max users i will have is 100000, how long should this pin code be? e.g. 123...
This should be a simple question, but I haven't been able to find a way to make it work. Essentially, I have a silly localhost page that I use in my webdevelopment. When I am surfing between our development server and my local version of the C# code (redirected from the dev url via host file) I have been known to sometimes forget what ...
I am currently writing a simple password generator (C#). For that I need some random Numbers. Is it OK to simply use the Random Class that ships with .NET or are there any known problems with that? ...
I have a directory with 2000 files or so. I want a script or a list of piped commands that will allow me to select a random sample of N files. ...
I have a list of objects and I want to reorder them randomly on each request. What is the best way of doing this? ...
What are the pros and cons of using System.Security.Cryptography.RNGCryptoServiceProvider vs System.Random are. I know that RNGCryptoServiceProvider is 'more random', i.e. less predictable for hackers. Any other pros or cons? UPDATE: According to the responses, here are the pros and cons of using RNGCryptoServiceProvider so far: Pro...
How can I get a random decimal.Decimal? it appears that the random module only returns floats which are a pita to convert to Decimals. ...
I'd like to create a random string, consisting of alpha-numeric characters. I want to be able to be specify the length of the string. How do I do this in C++? ...
I know how to generate a random number in PHP but lets say I want a random number between 1-10 but I want more 3,4,5's then 8,9,10's. How is this possible? I would post what I have tried but honestly, I don't even know where to start. ...