random

问题 I'm trying to populate a 2D array in javascript with random numbers. Although each column in the array is random, each row is identical which is not what I want (see image below). I want both rows and columns to be random. http://eeldesigns.com/image.jpg cols = 5; rows = 10; front = new Array(cols).fill(new Array(rows)); // Loop through Initial array to randomly place cells for(var x = 0; x < cols; x++){ for(var y = 0; y < rows; y++){ front[x][y] = Math.floor(Math.random()*5); } } console

问题 I'm trying to populate a 2D array in javascript with random numbers. Although each column in the array is random, each row is identical which is not what I want (see image below). I want both rows and columns to be random. http://eeldesigns.com/image.jpg cols = 5; rows = 10; front = new Array(cols).fill(new Array(rows)); // Loop through Initial array to randomly place cells for(var x = 0; x < cols; x++){ for(var y = 0; y < rows; y++){ front[x][y] = Math.floor(Math.random()*5); } } console

问题 I am trying to make a version of the Voltorb game from Pokemon Gold and Silver in Haskell. Now for generation of the board, I want to have a list of (l,r,v) triplets where l is the line, r is the row and v is the value of the field. Values l and r are implemented with list comprehension since they should be the same every time. As for v though I can't find an option to implement it so that it is 0,1,2 or 3 "randomly" (I know that Haskell is purely functional and there is no true randomness,

问题 I have a data set that is made up of a binary sequence, e.g. 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, ... the probability of 0 and 1 (noise) is different with 1 being less frequent. I want to know if these 1s happens in groups or they are really just random. How can I tell? If I feed it into randomness test, it will sure tell me the sequence are heavily gravitating toward 0. Would measuring the gap between 1s be a good test? I am most familiar with Python and C. 回答1: Here, the word "random"

问题 The famous linear congruential random number generator also known as minimal standard use formula x(i+1)=16807*x(i) mod (2^31-1) I want to implement this using Fortran. However, as pointed out by "Numerical Recipes", directly implement the formula with default Integer type (32bit) will cause 16807*x(i) to overflow. So the book recommend Schrage’s algorithm is based on an approximate factorization of m. This method can still implemented with default integer type. However, I am wondering

问题 I want enemies to randomly fall from the sky on my game and I do not know how to do this. I was using this youtube video: Falling Objects in Pygame. import pygame, random pygame.init() screen_width = 800 screen_height = 600 window = pygame.display.set_mode((screen_width, screen_height)) pygame.display.set_caption('Test') time = pygame.time.Clock() bg_color1 = (135, 142, 142) # MAIN BG COLOR bg_color2 = (255, 0, 0) # red bg_color3 = (255, 255, 0) # yellow UFO = pygame.image.load('ufo.png') bg

问题 I am trying to fill my array with random numbers using the following piece of code #include<iostream> #include<random> int main(){ int n = 5; int list[10]; std::random_device rd; std::mt19937 eng(rd()); std::uniform_int_distribution<> distr(0, 1000); for(int i=0;i<n;i++) list[i] = distr(eng); std::cout<<"The list of elements is: "; for(int i=0;i<n;i++) std::cout<<list[i]<<" "; } For n = 5, I always get the same output 562 726 348 916 6 For n = 6, I always get the same output 562 726 348 916 6

问题 Note: Running MariaDB 10.2.27 on Windows Server 2012 R2 Standard. I wanted to generate random integers for use in MariaDB so I have been experimenting with the MariaDB RAND() function. Either my expectations & understanding are way off base (definitely possible!) or the MariaDB RAND() function is not very random. Using a BIGINT(20) column I wanted to generate random integers up to 16 digits in length, so I used this SQL: FLOOR(RAND()*9999999999999999)+1) . The exact SQL I use, in a loop is:

问题 Note: Running MariaDB 10.2.27 on Windows Server 2012 R2 Standard. I wanted to generate random integers for use in MariaDB so I have been experimenting with the MariaDB RAND() function. Either my expectations & understanding are way off base (definitely possible!) or the MariaDB RAND() function is not very random. Using a BIGINT(20) column I wanted to generate random integers up to 16 digits in length, so I used this SQL: FLOOR(RAND()*9999999999999999)+1) . The exact SQL I use, in a loop is:

问题 Is there a way to randomize a limit number in SQL (MySQL)? What I'd like to be able to do is get a random number of results in a query to use in an insertion subquery without any server-side scripting. The query I'd love to be able to run as a hypothetical illustration is: SELECT id FROM users ORDER BY RAND() LIMIT RAND() * 1000 Of course that doesn't work, but is there another way to randomize the limit number? There are plenty of examples of randomizing a limited set of results, but I can't