I have a matrix that I want to randomize a couple of thousand times, while keeping the row and column totals the same: 1 2 3 A 0 0 1 B 1 1 0 C 1 0 0 An example of a valid random matrix would be: 1 2 3 A 1 0 0 B 1 1 0 C 0 0 1 My actual matrix is a lot bigger (about 600x600 items), so I really nee...
How can I change the date by the random number of days in PostgreSQL? Unfortunately http://stackoverflow.com/questions/1400505/postgresql-random-number-range-1-10 solution with trunc doesn't work: select date(now()) + (trunc(random() * 20)) results in: ERROR: operator does not exist: date + double precision LÍNEA 1: select date...
I generate random numbers and store them in an array. int RandomNumber = arc4random() % 12; [NSMutablearray *Number addObject:[NSNumber numberWithInt:RandomNumber]]; Now i want to make sure the same number is not created randomly again. Can any one please tell me how to do it with sample code. ...
I'm making a game which uses procedurally generated levels, and when I'm testing I'll often want to reproduce a level. Right now I haven't made any way to save the levels, but I thought a simpler solution would be to just reuse the seed used by Python's random module. However I've tried using both random.seed() and random.setstate() and ...
Javascript's MATH object has a random method that returns from the set [0,1) 0 inclusive, 1 exclusive. Is there a way to return a truly random method that includes 1. e.g. var rand = MATH.random()*2; if(rand > 1) { rand = MATH.floor(rand); } return rand; While this always returns a number from the set [0,1] it is not truly ran...
Hello, I'm trying to get a pick from my DB that would last for a day (daily pick). I use the following code: $query = 'SELECT * FROM table ORDER BY rand() LIMIT 1 But as you can see it only gives me a random pick from the table, and every time I refresh the page it gets me a new random pick. How can I make the pick to last for a whole...
Is it possible, from .NET, to mimic the exact randomization that Java uses? I have a seed, and I would like to be able to recieve the same results in both C# and Java when creating a random number. ...
How can I randomly generate letters according to their frequency of use in common speech? Any pseudo-code appreciated, but an implementation in Java would be fantastic. Otherwise just a poke in the right direction would be helpful. Note: I don't need to generate the frequencies of usage - I'm sure I can look that up easily enough. ...
I have a Perl DBM hash containing a list of URLs that I want to pick randomly from to load balance spidering sites. As a result I want to pick a key at random, or select the nth element (so I can randomise n). I'm aware this goes against the concept of a hash, but is this possible? NOTE: missed a valuable point that hash size will be ...
I searched SO for a similar Q/A to no avail. I want to shuffle the lines of a text file randomly and create a new file. The file may have several thousands of lines. How can I do that with cat, awk, cut, etc.? ...
I'm looking for a PRNG (pseudo randomness) that you initially seed with an arbitrary array of bytes. Heard of any? ...
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i've been trying to create a vb6 code that will randomize 10 questions but it's not working. i use sql as my database here's my code: Private Sub cmdNext_Click() Dim real_ans As String Dim nCnt As Integer 'nCnt = nCnt + 2 'Label3.Caption = nCnt real_ans = Adodc1.Recordset.Fields("answer") With Adodc2.Recordset Dim grade As String If...
Given an array of size n I want to generate random probabilities for each index such that Sigma(a[0]..a[n-1])=1 One possible result might be: 0 1 2 3 4 0.15 0.2 0.18 0.22 0.25 Another perfectly legal result can be: 0 1 2 3 4 0.01 0.01 0.96 0.01 0.01 How can I generate these easily and quick...
Does SQLite support seeding the RANDOM() function the same way MySQL does with RAND()? $query = "SELECT * FROM table ORDER BY RAND(" . date('Ymd') . ") LIMIT 1;"; From the MySQL Manual about RAND(N): If a constant integer argument N is specified, it is used as the seed value, which produces a repeatable sequence of column va...
Hey, for my selenium tests i need an value provider to get a 5-digit number in every case. The problem with javascript is that the api of Math.random only supports the genration of an 0. starting float. So it has to be between 10000 and 99999. So it would be easy if it would only generates 0.10000 and higher, but it also generates 0.01...
Does python's random.random() ever return 1.0 or it only returns up until 0.9999..? ...
Hi, I am writing a C++ program which needs to create a temporary file for its internal usage. I would like to allow concurrent executions of the program by running multiple proccesses, so the temporary file name needs to be randomized, that way each spawned process will generate a unique temporary file name for its own use. I am using r...
I'm trying to write a program to randomly generate music based on a simple set of rules. I would like the program to be able to generate its own sounds, as opposed to having a file with audio for each note. Does anyone know a simple way of doing this? It would be nice (but not essential) for the sound to be polytonal, and I would like a ...
I am generating some test-data and use dbms_random. I encountered some strange behavior when using dbms_random in the condition of the JOIN, that I can not explain: ------------------------# test-data (ids 1 .. 3) With x As ( Select Rownum id From dual Connect By Rownum <= 3 ) ------------------------# end of test-data Select x.id, ...