interpolation-growth-log.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('intlog');
    $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();
    ?>