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java.lang.Objectweka.filters.Filter
weka.filters.unsupervised.attribute.FirstOrder
public class FirstOrder
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, -0.2, 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.
-R <index1,index2-index4,...> Specify list of columns to take the differences between. First and last are valid indexes. (default none)
Constructor Summary | |
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FirstOrder()
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Method Summary | |
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java.lang.String |
attributeIndicesTipText()
Returns the tip text for this property |
java.lang.String |
getAttributeIndices()
Get the current range selection |
Capabilities |
getCapabilities()
Returns the Capabilities of this filter. |
java.lang.String[] |
getOptions()
Gets the current settings of the filter. |
java.lang.String |
globalInfo()
Returns a string describing this filter |
boolean |
input(Instance instance)
Input an instance for filtering. |
java.util.Enumeration |
listOptions()
Returns an enumeration describing the available options. |
static void |
main(java.lang.String[] argv)
Main method for testing this class. |
void |
setAttributeIndices(java.lang.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(java.lang.String[] options)
Parses a given list of options. |
Methods inherited from class weka.filters.Filter |
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batchFilterFile, batchFinished, filterFile, getCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, numPendingOutput, output, outputPeek, toString, useFilter, wekaStaticWrapper |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public FirstOrder()
Method Detail |
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public java.lang.String globalInfo()
public java.util.Enumeration listOptions()
listOptions
in interface OptionHandler
public void setOptions(java.lang.String[] options) throws java.lang.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
java.lang.Exception
- if an option is not supportedpublic java.lang.String[] getOptions()
getOptions
in interface OptionHandler
public Capabilities getCapabilities()
getCapabilities
in interface CapabilitiesHandler
getCapabilities
in class Filter
Capabilities
public boolean setInputFormat(Instances instanceInfo) throws java.lang.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
java.lang.Exception
- if only one attribute has been selected.public boolean input(Instance instance)
input
in class Filter
instance
- the input instance
java.lang.IllegalStateException
- if no input format has been defined.public java.lang.String attributeIndicesTipText()
public java.lang.String getAttributeIndices()
public void setAttributeIndices(java.lang.String rangeList) throws java.lang.Exception
rangeList
- a string representing the list of attributes. Since
the string will typically come from a user, attributes are indexed from
1. java.lang.Exception
- if an invalid range list is suppliedpublic void setAttributeIndicesArray(int[] attributes) throws java.lang.Exception
attributes
- an array containing indexes of attributes to select.
Since the array will typically come from a program, attributes are indexed
from 0.
java.lang.Exception
- if an invalid set of ranges is suppliedpublic static void main(java.lang.String[] argv)
argv
- should contain arguments to the filter: use -h for help
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