get extremes from list of numbers [closed]

Answer 1

Mine's similar to jprofitt's

but I divided them into peaks and valleys, so I can do some more stuff with it.

I think his loop is much more cleaner than mine is, but I just wanted to test it out for myself.
^{_{Don't judge meeeeee}}

This script just plots the points out and selects the peaks and valleys and give them green and red respectively. See it as a visual aid. :P

 $array[$i-1];
        $more_than_next = $array[$i] > $array[$i+1];

        $next_is_equal = $array[$i] == $array[$i+1];

        if($next_is_equal) continue;

        if($i == 0){
            if($more_than_next){
                $peaks[] = $array[$i];
                $peak_keys[] = $i;
            }else{
                $valleys[] = $array[$i];
                $valley_keys[] = $i;
            }
        }elseif($i == (count($array)-1)){
            if($more_than_last){
                $peaks[] = $array[$i];
                $peak_keys[] = $i;
            }else{
                $valleys[] = $array[$i];
                $valley_keys[] = $i;
            }
        }else{
            if($more_than_last && $more_than_next){
                $peaks[] = $array[$i];
                $peak_keys[] = $i;
            }elseif(!$more_than_last && !$more_than_next){
                $valleys[] = $array[$i];
                $valley_keys[] = $i;
            }
        }
    }

    return array("peaks" => $peaks, "valleys" => $valleys, "peak_keys" => $peak_keys, "valley_keys" => $valley_keys);
}
?>



";
foreach($plot as $key => $point){
    $left = ($key*10);
    $top = 400 - ($point*10);

    if(in_array($key, $res['peak_keys']) || in_array($key, $res['valley_keys'])){
        $extreme = "
$point
";
    }else{
        $extreme = "";
    }

    if(in_array($key, $res['peak_keys'])){
        $xc = "extr_high";
    }elseif(in_array($key, $res['valley_keys'])){
        $xc = "extr_low";
    }else{
        $xc = "";
    }

    echo "
$extreme
";
}
echo "