Useful Normalizing Functions (php)

useful normalizing functions for transfer of data into a neural net safe array (0-1) or for fitting data for a graph etc..

can also be used in reverse by using the array largest and least values.


= 0 && $stop <= count($stack) 1){ // limit recursion to bounds.
    if (is_in_rorder_key($check2)){
        $check =  $check2;
        $begin = $start-1; $ending = $stop;        
        $check3 = section_greedy($start-1, $stop 1); //recurse up
        if(is_in_rorder_key($check3)){
            $check = $check3;
            $moremore = section_greedy($start, $stop 1); //recurse down
            if(is_in_rorder_key($moremore)){
                $check =  $moremore;
                $begin = $start-2; $ending = $stop 2;
            }//fi
        }//fi
    }else{
        $check =  array_slice_key($stack, $start, $stop);
        $begin = $start; $ending = $stop;
    }//fi
    }//fi
    return $check;
}//end function

/*
returns an array of movements up/down and the change.
Array(
    [down] => 1178.36
    [up] => 419.05
    [change] => -759.31
)
*/
function examine_movement($arr){
    while(list($key,$val) = each($arr)){
        if($oldval == ""){$oldval = $val;}
        if($val > $oldval){
            $ret[up] += $val-$oldval;
        }else{
            $ret[down] += $oldval-$val;
        }
        $oldval = $val;        
    }//wend
    $ret[change] = $ret[up] - $ret[down];
    return $ret;
}

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