jpgraph

[kirke]

Perhaps someguys could know, I want to modify jpgraph.

function StockPlot(&$datay,$datax=false) {

$this->Plot($datay,$datax);
$this->numpoints /= $this->iTupleSize;
}

this is original code and i want to change like following
function StockPlot(&$datay,$datax=false, &$numy) {

$this->Plot($datay,$datax);
$this->numpoints = count($numy);
}

$this->numpoints is already existed. Do you know why this doesn't work?
Thank you in advance.