Re: random elements of an array

Oh, oops ... one line should not be in there ... remove this line from the randomize function: <snip> $usedIndexesArray[$i] = $randomIndex; </snip> It should not be there. I started to keep track of the indexes used, but i found better way to do it. So remove that line, it does nothing. -Nicole "Nicole Amashta" <430ntr3k@bellsouth.net> wrote in message news:20020322153412.57199.qmail@pb1.pair.com... > And, now, in PHP ... > > <? > /* > By Eva Nicole Amashta > 2002.03.22 > Testing randomizing an array. > */ > > > $myArray = array( 1, 12, 32, 14, 52, 9 ); > > echo "<p>Before randomized ... <p>"; > > ## print out array before randomized > for($i=0; $i<count($myArray); $i++) > { > echo $myArray[$i] . " "; > } > > reset( $myArray ); > > $myArray = randomize(&$myArray); > > ## now print out the array to see after randomized > > echo "<p>After randomized ... <p>"; > > for($i=0; $i<count($myArray); $i++) > { > echo $myArray[$i] . " "; > } > > > ////////////////////// > function randomize($someArray) ## uses rand() > { > $newArray = array(); > $sizeOfArray = count($someArray); > > for($i=0; $i<$sizeOfArray; $i++ ) > { > $randomIndex = rand(0, $sizeOfArray-1); > while ( count($newArray) > 0 && > in_array($someArray[$randomIndex],$newArray) ) > { > $randomIndex = rand(0, $sizeOfArray-1); > } > > $newArray[$i] = $someArray[ $randomIndex ]; > > $usedIndexesArray[$i] = $randomIndex; > } > > return $newArray; > } > ?> > > I have tested this. It works, Even after you refresh the page. Try it! > > Nicole > www.aeontrek.com > > > > "B.A.T. Svensson" <B.A.T.Svensson@lumc.nl> wrote in message > news:27E647E5629ED211BF78009027289C6303C1B777@mail1... > > You can completely randomize an array with n elements in n operations, by > > using the following brute force approach: > > > > void ScrambleIntList(int *pnElements, int nLen) > > { > > for (nLoop = 0, nLoop<nLen; nLopp++) { > > > > // Pic a random element > > int nRandomPic = nLen * rand(); > > > > file://Swap current element with the random pic > > int nTemp = pnElement[nLoop]; > > pnElement[nLoop] = Element[nRandomPic]; > > pnElement[nRandomPic] = nTemp; > > > > } > > } > > > > /Anders > > > > >-----Original Message----- > > >From: Afan Pasalic [mailto:afan@sprout.net] > > >Sent: Thursday, March 21, 2002 9:17 PM > > >To: php-windows@lists.php.net > > >Subject: [PHP-WIN] random elements of an array > > > > > > > > >Hi, > > > > > >My problem is: if I have an array (e.g. 1, 2, 3, 4, 5, 6, 7, > > >8, 9), how I can "shake" the array and get randomized order of > > >the same array (e.g. 5, 8, 1, 9, 3, 4, 7, 2, 6)? > > > > > >Thanks for any help! > > > > > > > > >Afan > > > > >