In what situations does the difference between random numbers generated on [0,1) and those generated on [0,1] make a difference?



I'm used to pseudo random number generators that return floating point values in the half open interval [0,1).


I've seen some reference to RNGs that can return values on the closed interval [0,1], e.g. this implementation of the Mersenne Twister.


I can see reasons why you'd want to exclude one, or both, of the endpoints for mathematical reasons, e.g.


exponentially_distributed=-logf( 1.0-rng() )


always yields a valid number if 0.0<=rng()<1.0.


But I can't think of a case where replacing an rng yielding [0,1] with one that yields [0,1) would produce any practi


Related to : In what situations does the difference between random numbers generated on [0,1) and those generated on [0,1] make a difference?
In what situations does the difference between random numbers generated on [0,1) and those generated on [0,1] make a difference?
Development Tools & Services

I'm used to pseudo random number generators that return floating point values in the half open interval [0,1).


I've seen some reference to RNGs that can return values on the closed interval [0,1], e.g. this implementation of the Mersenne Twister.


I can see reasons why you'd want to exclude one, or both, of the endpoints for mathematical reasons, e.g.


exponentially_distributed=-logf( 1.0-rng() )


always yields a valid number if 0.0<=rng()<1.0.


But I can't think of a case where replacing an rng yielding [0,1] with one that yields [0,1) would produce any practi

C++ Random Generated Numbers
Development Tools & Services

I'm busy with a game and need to place a number into a 2D array at random places on the array. How can I do that?


I have


for(int i = 0; i < rows; i++)
{
for(int j = 0; j < cols; j++)
{
array[1 + rand() % row][1 + rand() % col] == 5;
}
}

My program crashes when I run it. What could the problem be?


How do I make spaces between numbers in a random number generated app in C++?
Development Tools & Services

I need to be able to have spaces come up between each number. Here is my code. Any help would be awesome! This app allows you too have 6 rows of 6 numbers generated for your insta pick numbers between 1 - 49, it has to pick two rows of 6 numbers, 1 - 49 for twist and 1 row of 6 numbers for tag.


#include <iostream>
#include <iomanip>
#include <cstdlib>
using namespace std;
int main()
{
{
cout << "*** LOTTO MAX INSTA PICK ***" << endl;
cout<< " " << endl << endl;
}
{
cout << "Your Insta Pick N
How are random numbers generated
Development Tools & Services
Hi there,
As this is the 'random' forum, I was wondering...
Does anybody know how random numbers (such as Math.random()) are generated?
Get numbers that is unique from 100 times of random generated numbers
Development Tools & Services

First I wanted to generate random number from range 1 to 100 for 200 times. The random numbers generated for this 200 times can be repeated. Then finally get all numbers that only appear once in this 200 times generated random numbers.

And is it be okay if the range and the times generate are bigger than 1000?


Get numbers that is unique from 200 times of random generated numbers [on hold]
Development Tools & Services

First I wanted to generate random number from range 1 to 100 for 200 times. The random numbers generated for this 200 times can be repeated. How to get number(s) that is unique for this 200 times generated random numbers?

PS: The 200 times and range for random numbers is just an example. What if the range and times is more than 10000?

PS: This is not a homework. I just thought to make real life problem to be solved in code.

int main()
{
    int arr[150000] = {};
    int b[49900] = {0};

    //here generating 200 random int in range from 100 to 50000
    for(int i = 0; i < 150000; i++)
    {
        arr[i] = rand() % 50000 + 101;
    }

    //Take only unique numbers from arr[].
    for(int j = 0; j < 49900; j++)
    {
        for(int i = 0; i < 150000; i++)
        {
            if(arr[i] == j+1)
                b[j]+=1;
        }
    }

    //getting unique numbers 
    for(int j = 0; j< 49900; j++)
    {
        if(b[j] == 1){
            //print array numbers in array b that is unique
        }
    }

    system("pause");
    return 0;

}


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