Hi, I was wondering if there is a smart way to find out There is a 1/4 chance something happens. I know we can do this with rand() % 4 and checking if it is equal to 0, but is there a way without using rand()? In c++, thanks. ...
Is it possible to generate random numbers through physical process simulation? If I simulate the physical roll of a dice (i.e. you picking it up, shaking it in your hand, releasing it onto the table and recording which side ends up "up"...) will that produce a "random" number or would I just have a complex simulation which really accomp...
From what I understand, the standard generator is for the Normal Distribution. I have to generate random numbers according to the Normal, Uniform and Poisson Distributions, but I can't seem to find a class for the last 2. I have to generate them in the range of 0 - 999999. ...
To generate Random numbers from 1- 20 I need to pick selective and it should not be repetitive. How to do this in C# Note I need to loop through as like this Random rnd = new Random() rnd.Next(1,20) for(int i =0; i<=20;i++) { } For all the loops number should be 1 to 20 ...
Using PHP (other languages, using common built-ins are welcome), how can I get a random (or pseudo-random) number that does NOT match a certain criteria? IE: I want $x = rand(0, 99) but only if ($x % 9) != 0. What is a clean acceptable way to constrain random numbers to a criteria like that? As an example, using a while() loop, and p...
Hi, I am dealing with some computer security issues at the school at the moment and I am interested in general programming public preferences, customs, ideas etc. If you have to use a random number generator or extractor, which one do you choose? Why do you choose it? The mathematical properties, already implemented as a package or for w...
This is really weird, and I cannot see why this is happening. In the foreach cycle, I am iterating through a class A collection, and for each class, I call the Count() method, where r1 and r2 numbers are generated from range [-1,1]. The problem is that Random.Next returns the same "random" numbers for each instance. When the results for...
I'm writing a function that should generate random sudoku puzzles for a simulation project; this funcion takes as argoument the number of cells to generate then it generates the indexes of cells and numbers to put in those cells. I have a problem in generation of cells indexes, I'm not an expert in programming and i can't find a good ro...
I'm playing around with Win32::IE:Mechanize to try to access some authentication-required sites automatically. So far I've achieved moderate success, for example, I can automatically log in to my yahoo mailbox. But I find many sites are using some kind of image verification mechanism, which is possibly called CAPTCHA. I can do nothing to...
Hi there, I trying to fill an array of 20 ints with numbers from 1-20 in random sequence. here's my code: int lookup[20]={0}; int array[20]={0}; srand(time(NULL)); for(int i=0;i<20;++i){ bool done=false; while(!done){ int n=rand()%20; if(lookup[n]==0){ array[i]=n; lookup[n]=1; done...
Ok, im fairly new to android but i have managed to teach myself the basics, i am making an app where you press a button , and a new screen opens and it shows a randomly generated number, the only problem is i dont know how to generate and display the random number, i have been searching the web for ages and have only found little snippet...
Hi, Given that we start the call to the function ran2 with a negative integer [the seed] it will produce a series of random numbers. The sequence can be regenerated exactly if the same seed is used. Now my question is that is there a way that we can directly enter into some point in the sequence and then continue from that point onwar...
I have 2 numbers which are between 0 and 49. Let's call them x and y. Now I want to get a couple of other numbers which are not x or y, but are also between 0 and 49 (I am using Objective C but this is more of a general theory question I think?). Method I thought of is: int a; int b; int c; do { a = arc4random() % 49; } while (...
Hi. What is the best way to store a list of random numbers (like lotto/bingo numbers) and retrieve them? I'd like to store on a Database a number of rows, where each row contains 5-10 numbers ranging from 0 to 90. I will store a big number of those rows. What I'd like to be able is to retrieve the rows that have at least X number in comm...
How to generate random numbers using assembly code in the range 1--4 ? ...
For a simple simulation in C, I need to generate exponential random variables. I remember reading somewhere (but I can't find it now, and I don't remember why) that using the rand() function to generate random integers in a fixed range would generate non-uniformly distributed integers. Because of this, I'm wondering if this code might ha...
Hey Stackoverflow-Folks, is there any smart way to post random numbers (e.g. 1-4) in a list by using the smarty tpl-engine? standart list sorted 1-5: <ul> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> </ul> Here's my solution (PHP): <ul> {foreach from=randomNumbers} <li>{smarty.randomNumbers}</li> {/foreach} </ul>...
This MSDN article proves the correctness of Reservoir Sampling algorithm as follows: Base case is trivial. For the k+1st case, the probability a given element i with position <= k is in R is s/k. The probability i is replaced is the probability k+1st element is chosen multiplied by i being chosen to be replaced, which is: s/(k+1) * 1...
Hello I want to get N random numbers that the sum of them is a value. For example, let's suppose I want 5 random numbers that their sum is 1 Then, a valid possibility is: 0.2 0.2 0.2 0.2 0.2 Other possibility is: 0.8 0.1 0.03 0.03 0.04 And so on. I need this for the creation of the matrix of belongings of the Fuzzy C-means. ...
How does one make random numbers in the interval -10 to 10 in C++ ? srand(int(time(0)));//seed for(int i = 0; i < size; i++){ myArray[i] = 1 + rand() % 20 - 10;//this will give from -9 to 10 myArray2[i] =rand() % 20 - 10;//and this will -10 to 9 } ...