[Sommaire] [Imprimer]

   1  <?php
   2  include  ("../jpgraph.php");
   3  include  ("../jpgraph_scatter.php");
   4  include  ("../jpgraph_line.php");
   5  
   6  // Create some "fake" regression data
   7  $datay = array();
   8  $datay2 = array();
   9  $datax = array();
  10  $a=rand(-3,3);
  11  $b=rand(-5,5);
  12  for($x=0; $x<20; ++$x) {
  13      $datay[] = $a*$x + $b;
  14      $datay2[] = $a*$x + $b + rand(-30,30);
  15      $datax[] = $x;
  16  }
  17   
  18  // Create the graph
  19  $graph = new Graph(300,200,'auto');
  20  $graph->SetScale("linlin");
  21  
  22  // Setup title
  23  $graph->title->Set("Example of linear regression");
  24  $graph->title->SetFont(FF_FONT1,FS_BOLD);
  25  
  26  // make sure that the X-axis is always at the
  27  // bottom at the plot and not just at Y=0 which is
  28  // the default position
  29  $graph->xaxis->SetPos('min');
  30  
  31  // Create the scatter plot with some nice colors
  32  $sp1 = new ScatterPlot($datay2,$datax);
  33  $sp1->mark->SetType(MARK_FILLEDCIRCLE);
  34  $sp1->mark->SetFillColor("red");
  35  $sp1->SetColor("blue");
  36  $sp1->SetWeight(3);
  37  $sp1->mark->SetWidth(4);
  38  
  39  // Create the regression line
  40  $lplot = new LinePlot($datay);
  41  $lplot->SetWeight(2);
  42  $lplot->SetColor('navy');
  43  
  44  // Add the pltos to the line
  45  $graph->Add($sp1);
  46  $graph->Add($lplot);
  47  
  48  // ... and stroke
  49  $graph->Stroke();
  50  
  51  ?>
  52  
  53