PHP实现简单线性回归之数据研究工具

 ＜?php    // explore.php    if (!empty($x_values)) {      $X    = explode(",", $x_values);      $numX = count($X);    }      if (!empty($y_values)) {      $Y    = explode(",", $y_values);      $numY = count($Y);    }      // display entry data entry form if variables not set    if ( (empty($title)) OR (empty($x_name)) OR (empty($x_values)) OR          (empty($y_name)) OR (empty($conf_int)) OR (empty($y_values)) OR          ($numX != $numY) ) {               // Omitted code for displaying entry form          } else {            include_once "slr/SimpleLinearRegressionHTML.php";                            $slr = new SimpleLinearRegressionHTML($X, $Y, $conf_int);         echo "＜h2＞$title＜/h2＞";            $slr-＞showTableSummary($x_name, $y_name);      echo "＜br＞＜br＞";            $slr-＞showAnalysisOfVariance();        echo "＜br＞＜br＞";      $slr-＞showParameterEstimates($x_name, $y_name);       echo "＜br＞";      $slr-＞showFormula($x_name, $y_name);      echo "＜br＞＜br＞";      $slr-＞showRValues($x_name, $y_name);      echo "＜br＞";      include ("jpgraph/jpgraph.php");      include ("jpgraph/jpgraph_scatter.php");      include ("jpgraph/jpgraph_line.php");                                // The code for displaying the graphics is inline in the      // explore.php script.  The code for these two line plots      // finishes off the script:            // Omitted code for displaying scatter plus line plot      // Omitted code for displaying residuals plot          }    ?＞