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java.lang.Object | +--weka.filters.Filter | +--weka.filters.FirstOrderFilter
This instance filter takes a range of N numeric attributes and replaces them with N-1 numeric attributes, the values of which are the difference between consecutive attribute values from the original instance. eg:
Original attribute values
0.1, 0.2, 0.3, 0.1, 0.3
New attribute values
0.1, 0.1, 0.1, -0.2, -0.2
The range of attributes used is taken in numeric order. That is, a range spec of 7-11,3-5 will use the attribute ordering 3,4,5,7,8,9,10,11 for the differences, not 7,8,9,10,11,3,4,5.
Valid filter-specific options are:
-R index1,index2-index4,...
Specify list of columns to take the differences between.
First and last are valid indexes.
(default none)
Field Summary | |
protected Range |
m_DeltaCols
Stores which columns to take differences between |
Fields inherited from class weka.filters.Filter |
m_Debug, m_NewBatch |
Constructor Summary | |
FirstOrderFilter()
|
Method Summary | |
String |
attributeIndicesTipText()
Returns the tip text for this property |
String |
getAttributeIndices()
Get the current range selection |
String[] |
getOptions()
Gets the current settings of the filter. |
boolean |
input(Instance instance)
Input an instance for filtering. |
Enumeration |
listOptions()
Returns an enumeration describing the available options |
static void |
main(String[] argv)
Main method for testing this class. |
void |
setAttributeIndices(String rangeList)
Set which attributes are to be deleted (or kept if invert is true) |
void |
setAttributeIndicesArray(int[] attributes)
Set which attributes are to be deleted (or kept if invert is true) |
boolean |
setInputFormat(Instances instanceInfo)
Sets the format of the input instances. |
void |
setOptions(String[] options)
Parses a given list of options controlling the behaviour of this object. |
Methods inherited from class weka.filters.Filter |
batchFilterFile, batchFinished, bufferInput, copyStringValues, copyStringValues, filterFile, flushInput, getInputFormat, getInputStringIndex, getOutputFormat, getOutputStringIndex, getStringIndices, inputFormat, isOutputFormatDefined, numPendingOutput, output, outputFormat, outputFormatPeek, outputPeek, push, resetQueue, setOutputFormat, useFilter |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected Range m_DeltaCols
Constructor Detail |
public FirstOrderFilter()
Method Detail |
public Enumeration listOptions()
listOptions
in interface OptionHandler
public void setOptions(String[] options) throws Exception
-R index1,index2-index4,...
Specify list of columns to take the differences between.
First and last are valid indexes.
(default none)
setOptions
in interface OptionHandler
options
- the list of options as an array of strings
Exception
- if an option is not supportedpublic String[] getOptions()
getOptions
in interface OptionHandler
public boolean setInputFormat(Instances instanceInfo) throws Exception
setInputFormat
in class Filter
instanceInfo
- an Instances object containing the input instance
structure (any instances contained in the object are ignored - only the
structure is required).
UnsupportedAttributeTypeException
- if any of the
selected attributes are not numeric
Exception
- if only one attribute has been selected.public boolean input(Instance instance)
input
in class Filter
instance
- the input instance
IllegalStateException
- if no input format has been defined.public String attributeIndicesTipText()
public String getAttributeIndices()
public void setAttributeIndices(String rangeList) throws Exception
rangeList
- a string representing the list of attributes. Since
the string will typically come from a user, attributes are indexed from
1. Exception
- if an invalid range list is suppliedpublic void setAttributeIndicesArray(int[] attributes) throws Exception
attributes
- an array containing indexes of attributes to select.
Since the array will typically come from a program, attributes are indexed
from 0.
Exception
- if an invalid set of ranges is suppliedpublic static void main(String[] argv)
argv
- should contain arguments to the filter: use -h for help
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