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Class weka.filters.NominalToBinaryFilter
java.lang.Object
|
+----weka.filters.Filter
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+----weka.filters.NominalToBinaryFilter
- public class NominalToBinaryFilter
- extends Filter
- implements OptionHandler
Converts all nominal attributes into binary numeric
attributes. An attribute with k values is transformed into
k-1 new binary attributes (in a similar manner to CART if a
numeric class is assigned). Currently requires that a class attribute
be set (but this should be changed).
Valid filter-specific options are:
-N
If binary attributes are to be coded as nominal ones.
- Version:
- $Revision: 1.16.2.1 $
- Author:
- Eibe Frank (eibe@cs.waikato.ac.nz)
NominalToBinaryFilter()
-
batchFinished()
- Signify that this batch of input to the filter is finished.
getBinaryAttributesNominal()
- Gets if binary attributes are to be treated as nominal ones.
getOptions()
- Gets the current settings of the filter.
input(Instance)
- Input an instance for filtering.
listOptions()
- Returns an enumeration describing the available options
main(String[])
- Main method for testing this class.
setBinaryAttributesNominal(boolean)
- Sets if binary attributes are to be treates as nominal ones.
setInputFormat(Instances)
- Sets the format of the input instances.
setOptions(String[])
- Parses the options for this object.
NominalToBinaryFilter
public NominalToBinaryFilter()
setInputFormat
public boolean setInputFormat(Instances instanceInfo) throws java.lang.Exception
Sets the format of the input instances.
- Parameters:
instanceInfo
- an Instances object containing the input
instance structure (any instances contained in the object are
ignored - only the structure is required).
- Returns:
- true if the outputFormat may be collected immediately
- Throws:
- java.lang.Exception - if the input format can't be set
successfully
- Overrides:
- setInputFormat in class Filter
input
public boolean input(Instance instance)
Input an instance for filtering. Filter requires all
training instances be read before producing output.
- Parameters:
instance
- the input instance
- Returns:
- true if the filtered instance may now be
collected with output().
- Throws:
- java.lang.IllegalStateException - if no input format has been set
- Overrides:
- input in class Filter
batchFinished
public boolean batchFinished()
Signify that this batch of input to the filter is finished.
If the filter requires all instances prior to filtering,
output() may now be called to retrieve the filtered instances.
- Returns:
- true if there are instances pending output
- Throws:
- java.lang.IllegalStateException - if no input structure has been defined
- Overrides:
- batchFinished in class Filter
listOptions
public java.util.Enumeration listOptions()
Returns an enumeration describing the available options
- Returns:
- an enumeration of all the available options
setOptions
public void setOptions(java.lang.String options[]) throws java.lang.Exception
Parses the options for this object. Valid options are:
-N
If binary attributes are to be coded as nominal ones.
- Parameters:
options
- the list of options as an array of strings
- Throws:
- java.lang.Exception - if an option is not supported
getOptions
public java.lang.String[] getOptions()
Gets the current settings of the filter.
- Returns:
- an array of strings suitable for passing to setOptions
getBinaryAttributesNominal
public boolean getBinaryAttributesNominal()
Gets if binary attributes are to be treated as nominal ones.
- Returns:
- true if binary attributes are to be treated as nominal ones
setBinaryAttributesNominal
public void setBinaryAttributesNominal(boolean bool)
Sets if binary attributes are to be treates as nominal ones.
- Parameters:
bool
- true if binary attributes are to be treated as nominal ones
main
public static void main(java.lang.String argv[])
Main method for testing this class.
- Parameters:
argv
- should contain arguments to the filter:
use -h for help
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