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Class weka.filters.StringToNominalFilter
java.lang.Object
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+----weka.filters.Filter
|
+----weka.filters.StringToNominalFilter
- public class StringToNominalFilter
- extends Filter
- implements OptionHandler
Converts a string attribute (i.e. unspecified number of values) to nominal
(i.e. set number of values). You should ensure that all string values that
will appear are represented in the dataset.
Valid filter-specific options are:
-C col
Index of the attribute to be changed. (default last)
- Version:
- $Revision: 1.6 $
- Author:
- Len Trigg (len@intelligenesis.net)
StringToNominalFilter()
-
batchFinished()
- Signifies that this batch of input to the filter is finished.
getAttributeIndex()
- Get the index of the attribute used.
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.
setAttributeIndex(int)
- Sets index of the attribute used.
setInputFormat(Instances)
- Sets the format of the input instances.
setOptions(String[])
- Parses the options for this object.
StringToNominalFilter
public StringToNominalFilter()
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:
- UnsupportedAttributeTypeException - if the selected attribute
a string attribute.
- 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. The instance is processed
and made available for output immediately.
- Parameters:
instance
- the input instance.
- Returns:
- true if the filtered instance may now be
collected with output().
- Throws:
- java.lang.IllegalStateException - if no input structure has been defined.
- Overrides:
- input in class Filter
batchFinished
public boolean batchFinished()
Signifies 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:
-C col
The column containing the values to be merged. (default last)
- 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
getAttributeIndex
public int getAttributeIndex()
Get the index of the attribute used.
- Returns:
- the index of the attribute
setAttributeIndex
public void setAttributeIndex(int attIndex)
Sets index of the attribute used.
- Parameters:
index
- the index of the attribute
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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