Given an arbitrary enumeration in C#, how do I select a random value? (I did not find this very basic question on SO. I’ll post my answer in a minute as reference for anyone, but please feel free to post your own answer.) 11 Answers 11
I am a bit confused on what random.seed() does in Python. For example, why does the below trials do what they do (consistently)? >>> import random >>> random.seed(9001) >>> random.randint(1, 10) 1 >>> random.randint(1, 10) 3 >>> random.randint(1, 10) 6 >>> random.randint(1, 10) 6 >>> random.randint(1, 10) 7 I couldn’t find good documentation on this. … Read more
How do I pick a random element from a set? I’m particularly interested in picking a random element from a HashSet or a LinkedHashSet, in Java. Solutions for other languages are also welcome. 34 Answers 34 int size = myHashSet.size(); int item = new Random().nextInt(size); // In real life, the Random object should be rather … Read more
I have a file with some probabilities for different values e.g.: 1 0.1 2 0.05 3 0.05 4 0.2 5 0.4 6 0.2 I would like to generate random numbers using this distribution. Does an existing module that handles this exist? It’s fairly simple to code on your own (build the cumulative density function, generate … Read more
I’ve been using Random (java.util.Random) to shuffle a deck of 52 cards. There are 52! (8.0658175e+67) possibilities. Yet, I’ve found out that the seed for java.util.Random is a long, which is much smaller at 2^64 (1.8446744e+19). From here, I’m suspicious whether java.util.Random is really that random; is it actually capable of generating all 52! possibilities? … Read more
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++? 20 Answers 20
This question already has answers here: How to get a random number between a float range? (5 answers) Closed 4 years ago. I want a random number between 0 and 1, like 0.3452. I used random.randrange(0, 1) but it is always 0 for me. What should I do? 7 Answers 7
This question already has answers here: How do I generate random integers within a specific range in Java? (70 answers) Closed 8 years ago. I want to generate a number between 1 and 10 in Java. Here is what I tried: Random rn = new Random(); int answer = rn.nextInt(10) + 1; Is there a … Read more
I am trying to generate a random string in Go and here is the code I have written so far: package main import ( “bytes” “fmt” “math/rand” “time” ) func main() { fmt.Println(randomString(10)) } func randomString(l int) string { var result bytes.Buffer var temp string for i := 0; i < l; { if string(randInt(65, … Read more
As the GPU driver vendors don’t usually bother to implement noiseX in GLSL, I’m looking for a “graphics randomization swiss army knife” utility function set, preferably optimised to use within GPU shaders. I prefer GLSL, but code any language will do for me, I’m ok with translating it on my own to GLSL. Specifically, I’d … Read more
