attribute.html

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<A NAME="Attribute(java.lang.String, weka.core.Instances, int)"><!-- --></A><H3>
Attribute</H3>
<PRE>
public <B>Attribute</B>(java.lang.String&nbsp;attributeName,
                 <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;header,
                 int&nbsp;index)</PRE>
<DL>
<DD>Constructor for a relation-valued attribute with a particular index.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>attributeName</CODE> - the name for the attribute<DD><CODE>header</CODE> - the header information for this attribute<DD><CODE>index</CODE> - the attribute's index</DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
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</TABLE>

<A NAME="copy()"><!-- --></A><H3>
copy</H3>
<PRE>
public java.lang.Object <B>copy</B>()</PRE>
<DL>
<DD>Produces a shallow copy of this attribute.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../weka/core/Copyable.html#copy()">copy</A></CODE> in interface <CODE><A HREF="../../weka/core/Copyable.html" title="interface in weka.core">Copyable</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a copy of this attribute with the same index</DL>
</DD>
</DL>
<HR>

<A NAME="enumerateValues()"><!-- --></A><H3>
enumerateValues</H3>
<PRE>
public final java.util.Enumeration <B>enumerateValues</B>()</PRE>
<DL>
<DD>Returns an enumeration of all the attribute's values if the
 attribute is nominal, string, or relation-valued, null otherwise.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>enumeration of all the attribute's values</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public final boolean <B>equals</B>(java.lang.Object&nbsp;other)</PRE>
<DL>
<DD>Tests if given attribute is equal to this attribute.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>equals</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>other</CODE> - the Object to be compared to this attribute
<DT><B>Returns:</B><DD>true if the given attribute is equal to this attribute</DL>
</DD>
</DL>
<HR>

<A NAME="index()"><!-- --></A><H3>
index</H3>
<PRE>
public final int <B>index</B>()</PRE>
<DL>
<DD>Returns the index of this attribute.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the index of this attribute</DL>
</DD>
</DL>
<HR>

<A NAME="indexOfValue(java.lang.String)"><!-- --></A><H3>
indexOfValue</H3>
<PRE>
public final int <B>indexOfValue</B>(java.lang.String&nbsp;value)</PRE>
<DL>
<DD>Returns the index of a given attribute value. (The index of
 the first occurence of this value.)
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the value for which the index is to be returned
<DT><B>Returns:</B><DD>the index of the given attribute value if attribute
 is nominal or a string, -1 if it is not or the value 
 can't be found</DL>
</DD>
</DL>
<HR>

<A NAME="isNominal()"><!-- --></A><H3>
isNominal</H3>
<PRE>
public final boolean <B>isNominal</B>()</PRE>
<DL>
<DD>Test if the attribute is nominal.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if the attribute is nominal</DL>
</DD>
</DL>
<HR>

<A NAME="isNumeric()"><!-- --></A><H3>
isNumeric</H3>
<PRE>
public final boolean <B>isNumeric</B>()</PRE>
<DL>
<DD>Tests if the attribute is numeric.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if the attribute is numeric</DL>
</DD>
</DL>
<HR>

<A NAME="isRelationValued()"><!-- --></A><H3>
isRelationValued</H3>
<PRE>
public final boolean <B>isRelationValued</B>()</PRE>
<DL>
<DD>Tests if the attribute is relation valued.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if the attribute is relation valued</DL>
</DD>
</DL>
<HR>

<A NAME="isString()"><!-- --></A><H3>
isString</H3>
<PRE>
public final boolean <B>isString</B>()</PRE>
<DL>
<DD>Tests if the attribute is a string.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if the attribute is a string</DL>
</DD>
</DL>
<HR>

<A NAME="isDate()"><!-- --></A><H3>
isDate</H3>
<PRE>
public final boolean <B>isDate</B>()</PRE>
<DL>
<DD>Tests if the attribute is a date type.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if the attribute is a date type</DL>
</DD>
</DL>
<HR>

<A NAME="name()"><!-- --></A><H3>
name</H3>
<PRE>
public final java.lang.String <B>name</B>()</PRE>
<DL>
<DD>Returns the attribute's name.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the attribute's name as a string</DL>
</DD>
</DL>
<HR>

<A NAME="numValues()"><!-- --></A><H3>
numValues</H3>
<PRE>
public final int <B>numValues</B>()</PRE>
<DL>
<DD>Returns the number of attribute values. Returns 0 for 
 attributes that are not either nominal, string, or
 relation-valued.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the number of attribute values</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public final java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Returns a description of this attribute in ARFF format. Quotes
 strings if they contain whitespace characters, or if they
 are a question mark.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a description of this attribute as a string</DL>
</DD>
</DL>
<HR>

<A NAME="type()"><!-- --></A><H3>
type</H3>
<PRE>
public final int <B>type</B>()</PRE>
<DL>
<DD>Returns the attribute's type as an integer.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the attribute's type.</DL>
</DD>
</DL>
<HR>

<A NAME="getDateFormat()"><!-- --></A><H3>
getDateFormat</H3>
<PRE>
public final java.lang.String <B>getDateFormat</B>()</PRE>
<DL>
<DD>Returns the Date format pattern in case this attribute is of type DATE,
 otherwise an empty string.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the date format pattern<DT><B>See Also:</B><DD><CODE>SimpleDateFormat</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="value(int)"><!-- --></A><H3>
value</H3>
<PRE>
public final java.lang.String <B>value</B>(int&nbsp;valIndex)</PRE>
<DL>
<DD>Returns a value of a nominal or string attribute.  Returns an
 empty string if the attribute is neither a string nor a nominal
 attribute.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>valIndex</CODE> - the value's index
<DT><B>Returns:</B><DD>the attribute's value as a string</DL>
</DD>
</DL>
<HR>

<A NAME="relation()"><!-- --></A><H3>
relation</H3>
<PRE>
public final <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>relation</B>()</PRE>
<DL>
<DD>Returns the header info for a relation-valued attribute,
 null if the attribute is not relation-valued.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the attribute's value as an Instances object</DL>
</DD>
</DL>
<HR>

<A NAME="relation(int)"><!-- --></A><H3>
relation</H3>
<PRE>
public final <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> <B>relation</B>(int&nbsp;valIndex)</PRE>
<DL>
<DD>Returns a value of a relation-valued attribute. Returns
 null if the attribute is not relation-valued.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>valIndex</CODE> - the value's index
<DT><B>Returns:</B><DD>the attribute's value as an Instances object</DL>
</DD>
</DL>
<HR>

<A NAME="addStringValue(java.lang.String)"><!-- --></A><H3>
addStringValue</H3>
<PRE>
public int <B>addStringValue</B>(java.lang.String&nbsp;value)</PRE>
<DL>
<DD>Adds a string value to the list of valid strings for attributes
 of type STRING and returns the index of the string.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - The string value to add
<DT><B>Returns:</B><DD>the index assigned to the string, or -1 if the attribute is not
 of type Attribute.STRING</DL>
</DD>
</DL>
<HR>

<A NAME="addStringValue(weka.core.Attribute, int)"><!-- --></A><H3>
addStringValue</H3>
<PRE>
public int <B>addStringValue</B>(<A HREF="../../weka/core/Attribute.html" title="class in weka.core">Attribute</A>&nbsp;src,
                          int&nbsp;index)</PRE>