| <?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(); |
| |
| ?> |
| |
| |
