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   8          </style><hr><a name="_C_FUNCGENERATOR"><div style="background-color:yellow;font-family:courier new;"></a>CLASS <b>FuncGenerator</b></div>
   9  <i>(Defined in: jpgraph.php : 676)</i><table border=1><tr><td>&nbsp;<a href="FuncGenerator.html" style="font-family:arial;font-weight:bold;color:darkblue;">FuncGenerator</a>&nbsp;</td></tr><tr><td valign=top>&nbsp;<a href="FuncGenerator.html#_FUNCGENERATOR_E">E()</a>&nbsp;<br>
  10  &nbsp;<a href="FuncGenerator.html#_FUNCGENERATOR_FUNCGENERATOR">FuncGenerator()</a>&nbsp;<br>
  11  </td></tr></table>&nbsp;<p><div style="font-weight:bold;font-family:arial;font-size:100%;">Class usage and Overview</div>A utility class to help with function plots. This class supprots both ordinary one-variable plots with one dependent variable as well as polar plots.
  12  
  13  Basically you create an instance of this class with the function you want to plot as a string argument. The function should be created using 'x' as the independent variable. You then invoke its evaluation method 'E()' with the range for the independent variable and possibly a step size. The method then returns an array of X, and Y values that represents the plot.
  14  
  15  Please remember that the string should be specified with single quotes since otherwise PHP will try to interpret the variable in the string.
  16  
  17  For example, to specify a simple cos() plot you specify:
  18  
  19  $f = new FuncGenerator('cos($x)';
  20   <p> &nbsp;
  21  <hr><span style="font-family:arial;font-size:120%;font-weight:bold;">Class Methods</span><hr><p>
  22  <p>&nbsp; <p> &nbsp; <span style='font-size:110%;'><a name="_FUNCGENERATOR_E"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">
  23  function&nbsp;E($aXMin,$aXMax,$aSteps)</font>
  24  </b></div></a></span>
  25  
  26  <span style='font-family:arial;font-size:90%;'><i>Evaluate a X-Y function</i></span><p>
  27  
  28  <table cellspacing=0 style='border:black solid 1pt;' width=100%>
  29  <tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
  30  <tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
  31  $aXMin</font>
  32  
  33  </td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'>&nbsp;</td><td>Min x-value</td></tr>
  34  
  35  <tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
  36  $aXMax</font>
  37  
  38  </td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'>&nbsp;</td><td>Max x-value</td></tr>
  39  
  40  <tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
  41  $aSteps</font>
  42  
  43  </td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
  44  50</font>
  45  </td><td>Number of steps</td></tr>
  46  </table>
  47  
  48  <div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Evaluate the previous specified function between the specified values. The return two arrays representing the X and Y coordinates for the function.&nbsp;<br>
  49  
  50  <div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">
  51  //&nbsp;Create&nbsp;a&nbsp;simple&nbsp;linear&nbsp;plot
<br />$f&nbsp;=&nbsp;new&nbsp;FuncGenerator('cos($x)&nbsp;*&nbsp;sin($x)');
<br />list($xdata,$ydata)&nbsp;=&nbsp;$f-&gt;E(-2*M_PI,&nbsp;2*M_PI);
<br />
<br />$lp1&nbsp;=&nbsp;new&nbsp;LinePlot($ydata,$xdata);
<br />
<br />//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;polar&nbsp;plot&nbsp;(a&nbsp;circle)
<br />$p&nbsp;=&nbsp;new&nbsp;FuncGenerator('cos($i)',&nbsp;'sin($i)');
<br />list($x2data,$y2data)&nbsp;=&nbsp;$f-&gt;E(-2*M_PI,&nbsp;2*M_PI);
<br />
<br />$lp2&nbsp;=&nbsp;new&nbsp;LinePlot($y2data,$x2data);
<br />
<br />//...</font>
  52  </span><br>
  53  <p>
  54  <p>&nbsp; <p> &nbsp; <span style='font-size:110%;'><a name="_FUNCGENERATOR_FUNCGENERATOR"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">
  55  function&nbsp;FuncGenerator($aFunc,$aXFunc)</font>
  56  </b></div></a></span>
  57  
  58  <span style='font-family:arial;font-size:90%;'><i>Create a new function generator.</i></span><p>
  59  
  60  <table cellspacing=0 style='border:black solid 1pt;' width=100%>
  61  <tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
  62  <tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
  63  $aFunc</font>
  64  
  65  </td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'>&nbsp;</td><td>Function</td></tr>
  66  
  67  <tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
  68  $aXFunc</font>
  69  
  70  </td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
  71  ''</font>
  72  </td><td>X-Function</td></tr>
  73  </table>
  74  
  75  <div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Creates a new funciton generator. You can create both a linear plot as well as polar plot.
  76  
  77  For linear, one-variable plots, you must use '$x' as the independent variable.
  78  
  79  For polar plots you should use the index '$i' for the generating functions.
  80  &nbsp;<br>
  81  
  82  <div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">
  83  //&nbsp;Create&nbsp;a&nbsp;simple&nbsp;linear&nbsp;plot
<br />$f&nbsp;=&nbsp;new&nbsp;FuncGenerator('cos($x)&nbsp;*&nbsp;sin($x)');
<br />list($xdata,$ydata)&nbsp;=&nbsp;$f-&gt;E(-2*M_PI,&nbsp;2*M_PI);
<br />
<br />$lp1&nbsp;=&nbsp;new&nbsp;LinePlot($ydata,$xdata);
<br />
<br />//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;polar&nbsp;plot&nbsp;(a&nbsp;circle)
<br />$p&nbsp;=&nbsp;new&nbsp;FuncGenerator('cos($i)',&nbsp;'sin($i)');
<br />list($x2data,$y2data)&nbsp;=&nbsp;$f-&gt;E(-2*M_PI,&nbsp;2*M_PI);
<br />
<br />$lp2&nbsp;=&nbsp;new&nbsp;LinePlot($y2data,$x2data);
<br />
<br />//...
<br /></font>
  84  </span><br>
  85  <p> <hr> <p>