interpolation-growth.php
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<?php // content="text/plain; charset=utf-8"
require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_line.php');
require_once ('jpgraph/jpgraph_log.php');
 
// Matrix size rxr
$r = 10;
 
// Max Interpolation factor
$f = 5;
 
for( $i=1; $i <= $f; ++$i ) {
    $xdata[] = $i;
    $ydata[] =  pow( $r*pow(2,($i-1)) - ( pow(2,$i) - 1 ),2);
}
 
$graph = new Graph(400,240);
$graph->SetScale('intint');
$graph->SetMargin(50,50,20,30);
$graph->SetFrame(false);
$graph->SetBox(true,'black',2);
$graph->SetMarginColor('white');
$graph->SetColor('lightyellow@0.7');
 
$graph->title->Set('Interpolation growth for size 10x10');
$graph->title->SetFont(FF_FONT1,FS_BOLD);
 
$graph->xaxis->SetTitle('Interpolation factor','center');
$graph->xaxis->SetTitleMargin(10);
 
$graph->SetAxisStyle(AXSTYLE_YBOXIN);
$graph->xgrid->Show();
 
$lp1 = new LinePlot($ydata,$xdata);
$lp1->SetColor('darkred');
$lp1->SetWeight(3);
$graph->Add($lp1);
 
$graph->Stroke();
?>