Specify the number, sum, and minimum of arrays to get a set of random numbers

• The original requirements are as follows:

Given sum SUM(A), given minimum number M, given length S of sequence, and precision P of each number in sequence, 
 It is required that each number in the sequence must meet the requirements of a > = m, accuracy P, and uniformly increasing length S.
 Return to the sequence
 
 For example, SUM(A)=39, the minimum number is M1, the length S of the sequence is 6, and the precision P is 1. Here is a possible solution.
 
 1.0,3.2,5.1,7.3,9.8,12.6. 

• Java_random_numbers.java
  This code is to implement the specified array number, sum and minimum value to obtain a set of random numbers

/*package whatever //do not write package name here */

import java.io.*;
import java.util.Arrays;
class GFG {
    public static double[] getRandDistArray(int n, double m, double min)
{
    double randArray[] = new double[n];
    double sum = 0;

    // Generate n random numbers
    for (int i = 0; i < randArray.length; i++)
    {
        randArray[i] = Math.random();
        sum += randArray[i];
    }

    // check number value
    int cnt = 0;
    while (true)
    {
        if ((randArray[cnt] / sum * m) < min)
        {
            sum -= randArray[cnt];    
            randArray[cnt] = Math.random();
            sum += randArray[cnt];
            cnt = -1;
        }
    
        cnt++;
        if (cnt >= randArray.length)
        {
            break;
        }
        
    }
    // Normalize sum to m
    for (int i = 0; i < randArray.length; i++)
    {
        randArray[i] /= sum;
        randArray[i] *= m;
    }
    return randArray;
}
    
    public static void main (String[] args) {
        double sum[] = getRandDistArray(50, 1, 0.0001);
        Arrays.sort(sum);
        System.out.println(Arrays.toString(sum));
    }
}

Put the code on the following website to test:

https://ide.geeksforgeeks.org/index.php

01.png

• Java_random_numbers_with_precision.java
  This code is: specify the number of arrays, sum and minimum value, and generate a set of random numbers according to a certain interval and precision

The source code is: https://github.com/toniz/Java_random_numbers