weka.filters.unsupervised.instance
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:
Examples:
The table below describes the options available for SubsetByExpression.
Option |
Description |
---|---|
debug |
Turns on output of debugging information. |
expression |
The expression to used for filtering the dataset. |
The table below describes the capabilites of SubsetByExpression.
Capability |
Supported |
---|---|
Class |
Date class, Numeric class, Missing class values, Nominal class, No class, Binary class |
Attributes |
Missing values, Numeric attributes, Nominal attributes, Empty nominal attributes, Date attributes, Binary attributes, Unary attributes |
Min # of instances |
0 |