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• Matlab - binary vector with high concentration of 1s (or 0s)

  - by JohnIdol

  What's the best way to generate a number X of random binary vectors of size N with concentration of 1s (or, simmetrically, of 0s) that spans from very low to very high? Using randint or unidrnd (as in this question) will generate binary vectors with uniform distributions, which is not what I need in this case. Any help appreciated!

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• Example about crypto/rand in Go

  - by nevalu

  Could put a little example about the use of crypto/rand [1]? The function Read has as parameter an array of bytes. Why? If it access to /dev/urandom to get the random data. func Read(b []byte) (n int, err os.Error) [1] http://golang.org/pkg/crypto/rand/

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• Are there any cryptographically secure PRNG libraries for Delphi?

  - by dommer

  Can anyone recommend a cryptographically-secure pseudo random number generator library for Delphi (Win32)? Can be free or commercial, but will ideally be an active project. I'd like it to include source code.

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• How does MySQL's ORDER BY RAND() work?

  - by Eugene

  Hi, I've been doing some research and testing on how to do fast random selection in MySQL. In the process I've faced some unexpected results and now I am not fully sure I know how ORDER BY RAND() really works. I always thought that when you do ORDER BY RAND() on the table, MySQL adds a new column to the table which is filled with random values,…

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• Diehard test only integers?

  - by emmy

  i want to test some "random" numbers in (0 1). i will test them with the diehard tests battery, but i dont know if it tests numbers in (0 1). so diehard test any kind of numbers, or it just test intergers?

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• Making a string out of a string and an integer in Python

  - by Waterfox

  I get this error when trying to take an integer and prepend "b" to it, converting it into a string: File "program.py", line 19, in getname name = "b" + num TypeError: Can't convert 'int' object to str implicitly That's related to this function: num = random.randint(1,25) name = "b" + num

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• Rearranging a sequence

  - by sarah

  I'm have trouble rearranging sequences so the amount of letters in the given original sequence are the same in the random generated sequences. For example: If i have a string 'AAAC' I need that string rearranged randomly so the amount of A's and C's are the same.

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• How to generate irregular ball shapes?

  - by tomato

  What kind of algorithms would generate random "goo balls" like those in World of Goo. (btw, if you haven't played it yet, highly recommended). I'm using Proccesing, but any generic algorithm would do. I guess it boils down to how to "randomly" make balls that are kind of round, but not perfectly round, and still looking realistic. Thanks in…

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• How do you efficiently generate a list of K non-repeating integers between 0 and an upper bound N

  - by tucuxi

  The question gives all necessary data: what is an efficient algorithm to generate a sequence of K non-repeating integers within a given interval. The trivial algorithm (generating random numbers and, before adding them to the sequence, looking them up to see if they were already there) is very expensive if K is large and near enough to N. …

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• Generating n statements from context-free grammars

  - by Dervin Thunk

  Hello, So not to reinvent the wheel, I would like to know what has already been done about generating random statements from a context-free language (like those produced by yacc, etc.). These grammars are primarily for parsing, but maybe someone has done some generation for testing the parsers? Thanks

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• How do I randomly select from a list in Python?

  - by Liam Block

  Basically, I've got a homework task of programming a text based battle simulator in Python. Obviously I've gone with pokémon... I would like the enemy to be randomly selected, however I don't know how to randomly select from a list... foo = ['a', 'b', 'c', 'd', 'e'] from random import choice print choice(foo) This is what…

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• Python: why does `random.randint(a, b)` return a range inclusive of `b`?

  - by David Wolever

  It has always seemed strange to me that random.randint(a, b) would return an integer in the range [a, b], instead of [a, b-1] like range(...). Is there any reason for this apparent inconsistency?

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• Is rand() predictable in C++

  - by singh

  When I run the below program I always get the same values each time. Is rand not a true random function? int main() { while(1) { getch(); cout<<rand()<<endl; } } In each run I am getting the below values. 41 18467 6334 26500 19169 15724 ......

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• is rand() is perdicatable in C++

  - by singh

  Hi When i run below program i always get same values each time..Is rand is not a true random function. int main() { while(1) { getch(); cout<<rand()<<endl; } } In each run i am getting below values. 41 18467 6334 26500 19169 15724 ......

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• How to generate correlated binary variables

  - by jonalm

  Dear All I need to generate a series of N random binary variables with a given correlation function. Let x = {x_i} be a series of binary variables (taking the value 0 or 1, i running form 1 to N). The marginal probability is given Pr(x_i = 1) = p, and the values should be correlated in the following way E[ x_i x_j ] = const *…

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• MySQL ORDER BY rand(), name ASC

  - by Josh K

  I would like to take a database of say, 1000 users and select 20 random ones (ORDER BY rand(),LIMIT 20) then order the resulting set by the names. I came up with the following query which is not working like I hoped. SELECT * FROM users WHERE 1 ORDER BY rand(), name ASC LIMIT 20

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• Multi-threaded random_r is slower than single threaded version.

  - by Nixuz

  The following program is essentially the same the one described here. When I run and compile the program using two threads (NTHREADS == 2), I get the following run times: real 0m14.120s user 0m25.570s sys 0m0.050s When it is run with just one thread (NTHREADS == 1), I get run times significantly better…

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• SQL Randomization on Daily Basis

  - by mouthpiec

  Hi, I have an SQL listing shops, but i would like to random the results on a daily basis. For example today I list bat 2, 6, 9 etc and tomorrow, 6,1,7,9 etc Is there a way to implement this?

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• How could I generate instances of an object randomly at the top of the screen and make them "fall"?

  - by Custard

  I am making a game in Flash CS4 (actionscript 3) and I would like to be able to make "copies" of an instance that would randomly appear at the top of the screen and fall. For example, multiple objects(that are the same one) are falling from the top of the screen continuously, starting at random X positions. (i think this…

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• Generate non-repeating, no sequential numbers

  - by Sam Jarman

  how does one use code to do this: produce 15 random numbers that are not in any order, and that only occur once eg. 1 4, 2, 5, 3, 6, 8, 7, 9, 10, 13, 12, 15, 14, 11 rand() or arc4rand() can repeat some, which is not what im after. Thanks

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• What's the correct way to expand a [0,1] interval to [a,b]?

  - by Georg

  Many random-number generators return numbers between 0 and 1. What's the best and correct way to get numbers between a and b?

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• How can I randomly execute code 33% of the time in PHP?

  - by iTayb

  I'm not so sure how to write this: I want to generate a random number from 0 to 2, then write an if statement which executes specific code only 33% of the time. This is what I tried to do: if (rand(0, 3)=="2") { echo "Success" }; Thank you very much!

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• MATLAB: What is an appropriate Data Structure for a Matrix with Random Variable Entries?

  - by user12707

  I'm working in an area that is related to simulation and trying to design a data structure that can include random variables within matrices. I am currently coding in MATLAB. To motivate this let me say I have the following matrix: [a b; c d] I want to find a data structure that will allow for a, b, c, d to be either…

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• Random pauses with "Key dispatching timed out sending to <null>" when closing Android SurfaceView

  - by kenyee

  When I close an Android SurfaceView Activity, the app sometimes pauses and almost gets an ANR (Application Not Responding) message. Looking at LogCat, it appears to be timing out trying to send keys to it. I tried modifying the code to setFocusable(false) when in the onKeyDown handler for the SurfaceView, but that…

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• Random Access Violation Exception in WPF Application

  - by PT1984

  Hi, I am facing weird problem while running regression tests on my WPF Application. I am getting AccessViolationException with different stacktraces each time. First : Message :Attempted to read or write protected memory. This is often an indication that other memory is corrupt. StackTrace : at…

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