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Date Posted: 09:29:42 05/18/00 Thu
Author: Webmaster
Subject: Re: Generate a series of unique random number
In reply to: Derek Chiu 's message, "Generate a series of unique random number" on 17:57:47 05/14/00 Sun

Hi Derek,

Sorry for my late reply since I am very busy with my exam. The followings is a solution:

---
function get_randoms(num, max) {
//returns an array of random numbers ranging from 1 to max
//num = no. of unique number
//max = upper bound of random numbers
var resultst = "";
var result = new Array();
n = 0;
while (n<num) {
var random = get_random(max);
if (resultst.indexOf(random) == -1) {
resultst += random;
if (n<num-1) resultst += " "; // if not the last draw, append a space as separator
n++;
}
}
result = resultst.split(" ");
return result;
}

function get_random(max) {
//return random number ranging from 1 to max
return Math.ceil(Math.random() * max);
}

alert(get_randoms(10, 20));

---

Procedure:
1. Draw a number
2. If it does not exist in "resultst", append the number to "resultst". Otherwise, draw again.
3. Repeat step 2 until n=20 (20 numbers have been drawn)
4. Split "resultst" into an array "result" with the space as a separator.

Hope this helps and thank you for your visit.



> I would like to generate a series of 10 unique random
> number from 1 to 20. Can you give me some suggestion?
> Thanks a lot!

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Replies:

  • Re: Generate a series of unique random number -- Kent, 07:28:55 11/18/03 Tue
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