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Version 1.12

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nemunaire 2009-11-01 12:00:00 +01:00
commit de31cd3e9a
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53
jpgraph/Examples/example16.6.php
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<?php
include ("../jpgraph.php");
include ("../jpgraph_scatter.php");
include ("../jpgraph_line.php");
// Create some "fake" regression data
$datay = array();
$datay2 = array();
$datax = array();
$a=rand(-3,3);
$b=rand(-5,5);
for($x=0; $x<20; ++$x) {
$datay[] = $a*$x + $b;
$datay2[] = $a*$x + $b + rand(-30,30);
$datax[] = $x;
}
// Create the graph
$graph = new Graph(300,200,'auto');
$graph->SetScale("linlin");
// Setup title
$graph->title->Set("Example of linear regression");
$graph->title->SetFont(FF_FONT1,FS_BOLD);
// make sure that the X-axis is always at the
// bottom at the plot and not just at Y=0 which is
// the default position
$graph->xaxis->SetPos('min');
// Create the scatter plot with some nice colors
$sp1 = new ScatterPlot($datay2,$datax);
$sp1->mark->SetType(MARK_FILLEDCIRCLE);
$sp1->mark->SetFillColor("red");
$sp1->SetColor("blue");
$sp1->SetWeight(3);
$sp1->mark->SetWidth(4);
// Create the regression line
$lplot = new LinePlot($datay);
$lplot->SetWeight(2);
$lplot->SetColor('navy');
// Add the pltos to the line
$graph->Add($sp1);
$graph->Add($lplot);
// ... and stroke
$graph->Stroke();
?>