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<style type="text/css"><!--A:link {font-family: helvetica, arial, geneva, sans-serif; font-size: x-small; text-decoration: none; color: #0000ff}A:visited {font-family: helvetica, arial, geneva, sans-serif; font-size: x-small; text-decoration: none; color: #0000ff}A:hover {font-family: helvetica, arial, geneva, sans-serif; font-size: x-small; text-decoration: underline; color: #FF0000}th {font-family: helvetica, arial; color : blue; font-size:85%; background : lightgrey; border-right:black solid 1pt; border-bottom:black solid 1pt;}//--></style><hr><a name="_C_SPLINE"><div style="background-color:yellow;font-family:courier new;"></a>CLASS <b>Spline</b></div><i>(Defined in: jpgraph_regstat.php : 17)</i><table border=1><tr><td> <a href="Spline.html" style="font-family:arial;font-weight:bold;color:darkblue;">Spline</a> </td></tr><tr><td valign=top> <a href="Spline.html#_SPLINE_GET">Get()</a> <br> <a href="Spline.html#_SPLINE_SPLINE">Spline()</a> <br></td></tr></table> <p><div style="font-weight:bold;font-family:arial;font-size:100%;">Class usage and Overview</div>Utility class to help construct an interpolated data points given an arbitrary number of data points.<p>This class doesn't draw any graphs by itself it is only used to generate a new set of data points representing the smooth line from the input which are the control lines for the cubic spline.<p>The principle of using this class is that you first create an instance of this class and giving it the X,Y values for your control points.<p>You can then get back an interpolated smooth dataset by calling the Get() method. This method takeas as argument how many data points you want the interpolated graph to have.<p>Technical note: The spline is constructed with natural 2:nd derivates at the start and end points of the line.<p> <hr><span style="font-family:arial;font-size:120%;font-weight:bold;">Class Methods</span><hr><p><p> <p> <span style='font-size:110%;'><a name="_SPLINE_GET"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">function Get($num)</font></b></div></a></span><span style='font-family:arial;font-size:90%;'><i>Return the two new data vectors</i></span><p><table cellspacing=0 style='border:black solid 1pt;' width=100%><tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr><tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">$num</font></td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">50</font></td><td>Number of data points</td></tr></table><div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Return a data set representing the interpolated smooth curve passing through all the specified control points. <br><div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">$spline = new Spline($xcontrol_points, $ycontrol_points); <br />list ($xdata, $ydata) = $spline->Get(100); <br />$lp = new LinePlot($ydata, $xdata); <br /></font></span><br><p><p> <p> <span style='font-size:110%;'><a name="_SPLINE_SPLINE"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">function Spline($xdata,$ydata)</font></b></div></a></span><span style='font-family:arial;font-size:90%;'><i>Constructor. Create a new Spline object</i></span><p><table cellspacing=0 style='border:black solid 1pt;' width=100%><tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr><tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">$xdata</font></td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Control points. X-coordinates</td></tr><tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">$ydata</font></td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Control points. Y-coordinates</td></tr></table><div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Constructor. Create a new Spline object. The spline is determined by it's control points which are given with it's X and Y coordinates as arguments.<p>Technical note: The spline is constructed with natural 2:nd derivates at the start and end point. <br><div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">$spline = new Spline($xcontrol_points, $ycontrol_points); <br />list ($xdata, $ydata) = $spline->Get(100); <br />$lp = new LinePlot($ydata, $xdata); <br /></font></span><br><p> <hr> <p>