a help

[karthikeyan_coder]

a program that generates a list of 10,000 numbers in random order each time it is run. Each number in the list must be unique and be between 1 and 10,000

 

thanks.

[genericnumber1]

I doubt someone would just write the code for you, unless they're feeling overly generous. Try to write it yourself and come back to ask us questions, if you want someone to write the script for you post in the freelance forum.

[Navarr]

<?php
     function random_tenthou_gen() {
          $numlist = array();
          for($i = 0;$i < 10,001;$i++) {
               $numlist[] = rand(1,10000);
          }
          return $numlist;
     }
?>

 

Should do what you want.

[Barand]

@Navarr,

 

the for loop should be

 

for($i = 0;$i < 10000;$i++) {

 

But if you look at the results, uniqueness criteria is not met

 

<?php
     function random_tenthou_gen() {
          $numlist = array();
          for($i = 0;$i < 10000;$i++) {
               $numlist[] = rand(1,10000);
          }
          return $numlist;
     }
     
     
     $a = random_tenthou_gen();
     
     /**
     * Analyse results
     */
     $ka = array_count_values($a);
     $kb = array_count_values($ka);
     ksort($kb);
     $tot=0;
     foreach ($kb as $occ => $count) {
        echo "$count numbers occurred $occ times<br>";
        $tot += $count*$occ;
     }
     echo "<br/>TOTAL: $tot";
?>

[Barand]

a program that generates a list of 10,000 numbers in random order each time it is run. Each number in the list must be unique and be between 1 and 10,000

 

thanks.

 

try

 

     $a = range(1,10000);
     shuffle($a);

[jchemie]

Well the prev one was a beauty.

 

One more logic i find good is as under

 

error_reporting(0);
while(count($nos) < 10000)
{
$no = rand(1, 10000);
if(!(in_array($no,$nos, true)))
{
$nos[] = $no;
}
}

[Glyde]

Here:

<?php
function randomArray($amount=10000) {
     $usedNumbers = array();
     for ($i = 0; $i < $amount; $i++) {
          $randomNumber = rand(1, $amount);
          while (in_array($randomNumber, $usedNumbers)) $randomNumber = rand(1, $amount);
          $usedNumbers[] = $randomNumber;
     }
}
?>

It's going to be slow as hell trying to do 10,000 though.

[genericnumber1]

I prefer Barand's approach, here it is in function form...

 

<?php
function randArray($from = 1, $to = 10000)
{
   $numbers = range($from, $to);
   shuffle($numbers);
   return $numbers;
}
?>

[Barand]

 

It's going to be slow as hell trying to do 10,000 though.

 

Only 750 times longer than my method (15 sec vs 0.02)