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java.lang.Objectweka.filters.Filter
weka.filters.SimpleFilter
weka.filters.SimpleBatchFilter
weka.filters.unsupervised.instance.SubsetByExpression
public class SubsetByExpression
Filters instances according to a user-specified expression.
Grammar:
boolexpr_list ::= boolexpr_list boolexpr_part | boolexpr_part;
boolexpr_part ::= boolexpr:e {: parser.setResult(e); :} ;
boolexpr ::= BOOLEAN
| true
| false
| expr < expr
| expr <= expr
| expr > expr
| expr >= expr
| expr = expr
| ( boolexpr )
| not boolexpr
| boolexpr and boolexpr
| boolexpr or boolexpr
| ATTRIBUTE is STRING
;
expr ::= NUMBER
| ATTRIBUTE
| ( expr )
| opexpr
| funcexpr
;
opexpr ::= expr + expr
| expr - expr
| expr * expr
| expr / expr
;
funcexpr ::= abs ( expr )
| sqrt ( expr )
| log ( expr )
| exp ( expr )
| sin ( expr )
| cos ( expr )
| tan ( expr )
| rint ( expr )
| floor ( expr )
| pow ( expr for base , expr for exponent )
| ceil ( expr )
;
Notes:
- NUMBER
any integer or floating point number
(but not in scientific notation!)
- STRING
any string surrounded by single quotes;
the string may not contain a single quote though.
- ATTRIBUTE
the following placeholders are recognized for
attribute values:
- CLASS for the class value in case a class attribute is set.
- ATTxyz with xyz a number from 1 to # of attributes in the
dataset, representing the value of indexed attribute.
Examples:
- extracting only mammals and birds from the 'zoo' UCI dataset:
(CLASS is 'mammal') or (CLASS is 'bird')
- extracting only animals with at least 2 legs from the 'zoo' UCI dataset:
(ATT14 >= 2)
- extracting only instances with non-missing 'wage-increase-second-year'
from the 'labor' UCI dataset:
not ismissing(ATT3)
-E <expr> The expression to use for filtering (default: true).
| Constructor Summary | |
|---|---|
SubsetByExpression()
|
|
| Method Summary | |
|---|---|
java.lang.String |
expressionTipText()
Returns the tip text for this property. |
Capabilities |
getCapabilities()
Returns the Capabilities of this filter. |
java.lang.String |
getExpression()
Returns the expression used for filtering. |
java.lang.String[] |
getOptions()
Gets the current settings of the filter. |
java.lang.String |
getRevision()
Returns the revision string. |
java.lang.String |
globalInfo()
Returns a string describing this filter. |
java.util.Enumeration |
listOptions()
Returns an enumeration describing the available options. |
static void |
main(java.lang.String[] args)
Main method for running this filter. |
void |
setExpression(java.lang.String value)
Sets the expression used for filtering. |
void |
setOptions(java.lang.String[] options)
Parses a given list of options. |
| Methods inherited from class weka.filters.SimpleBatchFilter |
|---|
batchFinished, input |
| Methods inherited from class weka.filters.SimpleFilter |
|---|
debugTipText, getDebug, setDebug, setInputFormat |
| Methods inherited from class weka.filters.Filter |
|---|
batchFilterFile, filterFile, getCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, numPendingOutput, output, outputPeek, toString, useFilter, wekaStaticWrapper |
| Methods inherited from class java.lang.Object |
|---|
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public SubsetByExpression()
| Method Detail |
|---|
public java.lang.String globalInfo()
globalInfo in class SimpleFilterpublic java.util.Enumeration listOptions()
listOptions in interface OptionHandlerlistOptions in class SimpleFilter
public void setOptions(java.lang.String[] options)
throws java.lang.Exception
-E <expr> The expression to use for filtering (default: true).
setOptions in interface OptionHandlersetOptions in class SimpleFilteroptions - the list of options as an array of strings
java.lang.Exception - if an option is not supportedSimpleFilter.reset()public java.lang.String[] getOptions()
getOptions in interface OptionHandlergetOptions in class SimpleFilterpublic Capabilities getCapabilities()
getCapabilities in interface CapabilitiesHandlergetCapabilities in class FilterCapabilitiespublic void setExpression(java.lang.String value)
value - the expressionpublic java.lang.String getExpression()
public java.lang.String expressionTipText()
public java.lang.String getRevision()
getRevision in interface RevisionHandlergetRevision in class Filterpublic static void main(java.lang.String[] args)
args - arguments for the filter: use -h for help
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