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		</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>&nbsp;<a href="Spline.html" style="font-family:arial;font-weight:bold;color:darkblue;">Spline</a>&nbsp;</td></tr><tr><td valign=top>&nbsp;<a href="Spline.html#_SPLINE_GET">Get()</a>&nbsp;<br>

&nbsp;<a href="Spline.html#_SPLINE_SPLINE">Spline()</a>&nbsp;<br>

</td></tr></table>&nbsp;<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> &nbsp;

<hr><span style="font-family:arial;font-size:120%;font-weight:bold;">Class Methods</span><hr><p>

<p>&nbsp; <p> &nbsp; <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&nbsp;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.&nbsp;<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, $ycontrol_points);
<br />list&nbsp;($xdata,&nbsp;$ydata)&nbsp;=&nbsp;$spline-&gt;Get(100);
<br />$lp&nbsp;=&nbsp;new&nbsp;LinePlot($ydata,&nbsp;$xdata);
<br /></font>

</span><br>

<p>

<p>&nbsp; <p> &nbsp; <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&nbsp;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>

<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>

$xdata</font>

</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'>&nbsp;</td><td>Control points. X-coordinates</td></tr>

$ydata</font>

</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'>&nbsp;</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>

<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, $ycontrol_points);
<br />list&nbsp;($xdata,&nbsp;$ydata)&nbsp;=&nbsp;$spline-&gt;Get(100);
<br />$lp&nbsp;=&nbsp;new&nbsp;LinePlot($ydata,&nbsp;$xdata);
<br /></font>

<p> <hr> <p>