Weka package using the mXparser library.
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README.md

MxExpression

Weka package that uses the mXparser library for mathematical expressions on numeric attributes.

The following schemes are available:

  • weka.filters.unsupervised.attribute.MXExpression - updates the specified target attribute with the value derived from the the expression.
  • weka.classifiers.functions.MXExpression - simple classifier that just applies a formula to the data and outputs the calculated value as prediction. This can be used to compare algorithms based on mathematical formulas with other Weka classifiers.

You can use attribute values via their 1-based index (as in attX and X being the 1-based index) or their name (lower case name gets stripped off of all non-alphanumeric characters, eg 'My Att 1' becomes 'myatt1').

It is also possible to restrict the evaluation to a subset of the attributes in the data, by using the -attributes option to define the attribute range. The default is to operate on all attributes.

Main functionality of the mXparser library:

  • basic operators, i.e.: +, -, *, ^, !
  • Boolean logic operators i.e.: or, and, xor
  • binary relations i.e.: =, <, >
  • math functions (large library of 1-arg, 2-arg, 3-arg - - functions) i.e.: sin, cos, Stirling numbers, log, inverse functions
  • constants (large library), i.e.: pi, e, golden ratio
  • n-args functions i.e.: greatest common divisor
  • iterated summation and product operators
  • differentiation and integration

Releases

Click on one of the following links to download the corresponding Weka package:

How to use packages

For more information on how to install the package, see:

https://waikato.github.io/weka-wiki/packages/manager/

Maven

Add the following dependency in your pom.xml to include the package:

    <dependency>
      <groupId>com.github.fracpete</groupId>
      <artifactId>mxexpression-weka-package</artifactId>
      <version>2018.3.2</version>
      <type>jar</type>
      <exclusions>
        <exclusion>
          <groupId>nz.ac.waikato.cms.weka</groupId>
          <artifactId>weka-dev</artifactId>
        </exclusion>
      </exclusions>
    </dependency>