attributeexpressionfilter.html

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<B>Method Detail</B></FONT></TD>
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<A NAME="globalInfo()"><!-- --></A><H3>
globalInfo</H3>
<PRE>
public java.lang.String <B>globalInfo</B>()</PRE>
<DL>
<DD>Returns a string describing this filter<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a description of the filter suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="listOptions()"><!-- --></A><H3>
listOptions</H3>
<PRE>
public java.util.Enumeration <B>listOptions</B>()</PRE>
<DL>
<DD>Returns an enumeration describing the available options<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#listOptions()">listOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an enumeration of all the available options</DL>
</DD>
</DL>
<HR>

<A NAME="setOptions(java.lang.String[])"><!-- --></A><H3>
setOptions</H3>
<PRE>
public void <B>setOptions</B>(java.lang.String[]&nbsp;options)
                throws java.lang.Exception</PRE>
<DL>
<DD>Parses a list of options for this object. Valid options are:<p>

 -E expression <br>
 Specify the expression to apply. Eg. a1^2*a5/log(a7*4.0). <p>

 -N name <br>
 Specify a name for the new attribute. Default is to name it with the
 expression provided with the -E option. <p>

 -D <br>
 Debug. Names the attribute with the postfix parse of the expression. <p><DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#setOptions(java.lang.String[])">setOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>options</CODE> - the list of options as an array of strings<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an option is not supported</DL>
</DD>
</DL>
<HR>

<A NAME="getOptions()"><!-- --></A><H3>
getOptions</H3>
<PRE>
public java.lang.String[] <B>getOptions</B>()</PRE>
<DL>
<DD>Gets the current settings of the filter.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/core/OptionHandler.html#getOptions()">getOptions</A></CODE> in interface <CODE><A HREF="../../weka/core/OptionHandler.html">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an array of strings suitable for passing to setOptions</DL>
</DD>
</DL>
<HR>

<A NAME="nameTipText()"><!-- --></A><H3>
nameTipText</H3>
<PRE>
public java.lang.String <B>nameTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setName(java.lang.String)"><!-- --></A><H3>
setName</H3>
<PRE>
public void <B>setName</B>(java.lang.String&nbsp;name)</PRE>
<DL>
<DD>Set the name for the new attribute. The string "expression" can
 be used to make the name of the new attribute equal to the expression
 provided.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name of the new attribute</DL>
</DD>
</DL>
<HR>

<A NAME="getName()"><!-- --></A><H3>
getName</H3>
<PRE>
public java.lang.String <B>getName</B>()</PRE>
<DL>
<DD>Returns the name of the new attribute<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the name of the new attribute</DL>
</DD>
</DL>
<HR>

<A NAME="debugTipText()"><!-- --></A><H3>
debugTipText</H3>
<PRE>
public java.lang.String <B>debugTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setDebug(boolean)"><!-- --></A><H3>
setDebug</H3>
<PRE>
public void <B>setDebug</B>(boolean&nbsp;d)</PRE>
<DL>
<DD>Set debug mode. Causes the new attribute to be named with the postfix
 parse of the expression<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>d</CODE> - true if debug mode is to be used</DL>
</DD>
</DL>
<HR>

<A NAME="getDebug()"><!-- --></A><H3>
getDebug</H3>
<PRE>
public boolean <B>getDebug</B>()</PRE>
<DL>
<DD>Gets whether debug is set<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if debug is set</DL>
</DD>
</DL>
<HR>

<A NAME="expressionTipText()"><!-- --></A><H3>
expressionTipText</H3>
<PRE>
public java.lang.String <B>expressionTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>tip text for this property suitable for
 displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setExpression(java.lang.String)"><!-- --></A><H3>
setExpression</H3>
<PRE>
public void <B>setExpression</B>(java.lang.String&nbsp;expr)</PRE>
<DL>
<DD>Set the expression to apply<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expr</CODE> - a mathematical expression to apply</DL>
</DD>
</DL>
<HR>

<A NAME="getExpression()"><!-- --></A><H3>
getExpression</H3>
<PRE>
public java.lang.String <B>getExpression</B>()</PRE>
<DL>
<DD>Get the expression<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the expression</DL>
</DD>
</DL>
<HR>

<A NAME="setInputFormat(weka.core.Instances)"><!-- --></A><H3>
setInputFormat</H3>
<PRE>
public boolean <B>setInputFormat</B>(<A HREF="../../weka/core/Instances.html">Instances</A>&nbsp;instanceInfo)
                       throws java.lang.Exception</PRE>
<DL>
<DD>Sets the format of the input instances.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/filters/Filter.html#setInputFormat(weka.core.Instances)">setInputFormat</A></CODE> in class <CODE><A HREF="../../weka/filters/Filter.html">Filter</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instanceInfo</CODE> - an Instances object containing the input instance
 structure (any instances contained in the object are ignored - only the
 structure is required).<DT><B>Returns:</B><DD>true if the outputFormat may be collected immediately<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if the format couldn't be set successfully</DL>
</DD>
</DL>
<HR>

<A NAME="input(weka.core.Instance)"><!-- --></A><H3>
input</H3>
<PRE>
public boolean <B>input</B>(<A HREF="../../weka/core/Instance.html">Instance</A>&nbsp;instance)
              throws java.lang.Exception</PRE>
<DL>
<DD>Input an instance for filtering. Ordinarily the instance is processed
 and made available for output immediately. Some filters require all
 instances be read before producing output.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/filters/Filter.html#input(weka.core.Instance)">input</A></CODE> in class <CODE><A HREF="../../weka/filters/Filter.html">Filter</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the input instance<DT><B>Returns:</B><DD>true if the filtered instance may now be
 collected with output().<DT><B>Throws:</B><DD><CODE>java.lang.IllegalStateException</CODE> - if no input format has been defined.<DD><CODE>java.lang.Exception</CODE> - if there was a problem during the filtering.</DL>
</DD>
</DL>
<HR>

<A NAME="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <B>main</B>(java.lang.String[]&nbsp;args)</PRE>
<DL>
<DD>Main method for testing this class.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>args</CODE> - should contain arguments to the filter: use -h for help</DL>
</DD>
</DL>
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