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git-svn-id: http://www.observium.org/svn/observer/trunk@358 61d68cd4-352d-0410-923a-c4978735b2b8
70 lines
5.2 KiB
HTML
70 lines
5.2 KiB
HTML
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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>
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<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>
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<a href="Spline.html#_SPLINE_SPLINE">Spline()</a> <br>
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</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.
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<p>
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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.
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<p>
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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.
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<p>
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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.
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<p>
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Technical note: The spline is constructed with natural 2:nd derivates at the start and end points of the line.
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<p>
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<hr><span style="font-family:arial;font-size:120%;font-weight:bold;">Class Methods</span><hr><p>
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<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">
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function Get($num)</font>
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</b></div></a></span>
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<span style='font-family:arial;font-size:90%;'><i>Return the two new data vectors</i></span><p>
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<table cellspacing=0 style='border:black solid 1pt;' width=100%>
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<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$num</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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50</font>
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</td><td>Number of data points</td></tr>
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</table>
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<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>
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<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">
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$spline = new Spline($xcontrol_points, $ycontrol_points);
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<br />list ($xdata, $ydata) = $spline->Get(100);
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<br />$lp = new LinePlot($ydata, $xdata);
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<br /></font>
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</span><br>
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<p>
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<p> <p> <span style='font-size:110%;'><a name="_SPLINE_SPLINE"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">
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function Spline($xdata,$ydata)</font>
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</b></div></a></span>
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<span style='font-family:arial;font-size:90%;'><i>Constructor. Create a new Spline object</i></span><p>
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<table cellspacing=0 style='border:black solid 1pt;' width=100%>
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<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$xdata</font>
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</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>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$ydata</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Control points. Y-coordinates</td></tr>
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</table>
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<div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Constructor. Create a new Spline object. The spline is determined by it's control points which are given with it's X and Y coordinates as arguments.
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<p>
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Technical note: The spline is constructed with natural 2:nd derivates at the start and end point. <br>
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<div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">
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$spline = new Spline($xcontrol_points, $ycontrol_points);
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<br />list ($xdata, $ydata) = $spline->Get(100);
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<br />$lp = new LinePlot($ydata, $xdata);
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<br /></font>
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</span><br>
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<p> <hr> <p> |