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Using Weka from Windows prompt

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Alessio Villardita

Configuring the CLASSPATH environment variable on Windows 8.1 to use WEKA tools from the command line with Java. Mark Hall, Eibe Frank, Geoffrey Holmes, Bernhard Pfahringer, Peter Reutemann, Ian H. Witten (2009); The WEKA Data Mining Software: An Update; SIGKDD Explorations, Volume 11, Issue 1.

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WEKA Adding weka.jar to CLASSPATH on Windows 8.1
Three simple phases 1. Locate WEKA installation directory 2. Create/edit the CLASSPATH environment variable 3. Execute the weka.gui.GUIChooser main class
Locate WEKA installation directory In this case the directory is “C:devWeka-3-6”. The file name required is: “weka.jar”.
Assumptions for phase 2 The following pictures are taken on Windows 8.1 with Italian interface, so consider that: 1) @1st step use the search tool by moving the pointer on the right side of the screen and type “environment variables” and open the editor for them 2) @2nd step there are two possibilities for the CLASSPATH env. var.: a) it does not exist and then it must be created; click on “New” b) it already exists and then it must be edited; click on “Edit” and add the WEKA path
Create/edit the CLASSPATH environment variable 1st step 2nd step
Create/edit the CLASSPATH environment variable The value must include “weka.jar” NOTE: the pictures shows case a, where no other paths are in the CLASSPATH because it has been created on purpose. 3rd step
Finale: execute weka.jar main class The weka.jar archive has the following main class: weka.gui.GUIChooser The following command will launch the WEKA GUI: java weka.gui.GUIChooser
Launching WEKA tools It is possible to call WEKA tools externally just specifying their package and name, for example: java weka.filters.unsupervised.attribute.PrincipalComponents -i C:devWeka-3-6datairis.arff -o iris-PC.arff -c last

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Using Weka from Windows prompt

  • 1. WEKA Adding weka.jar to CLASSPATH on Windows 8.1
  • 2. Three simple phases 1. Locate WEKA installation directory 2. Create/edit the CLASSPATH environment variable 3. Execute the weka.gui.GUIChooser main class
  • 3. Locate WEKA installation directory In this case the directory is “C:devWeka-3-6”. The file name required is: “weka.jar”.
  • 4. Assumptions for phase 2 The following pictures are taken on Windows 8.1 with Italian interface, so consider that: 1) @1st step use the search tool by moving the pointer on the right side of the screen and type “environment variables” and open the editor for them 2) @2nd step there are two possibilities for the CLASSPATH env. var.: a) it does not exist and then it must be created; click on “New” b) it already exists and then it must be edited; click on “Edit” and add the WEKA path
  • 5. Create/edit the CLASSPATH environment variable 1st step 2nd step
  • 6. Create/edit the CLASSPATH environment variable The value must include “weka.jar” NOTE: the pictures shows case a, where no other paths are in the CLASSPATH because it has been created on purpose. 3rd step
  • 7. Finale: execute weka.jar main class The weka.jar archive has the following main class: weka.gui.GUIChooser The following command will launch the WEKA GUI: java weka.gui.GUIChooser
  • 8. Launching WEKA tools It is possible to call WEKA tools externally just specifying their package and name, for example: java weka.filters.unsupervised.attribute.PrincipalComponents -i C:devWeka-3-6datairis.arff -o iris-PC.arff -c last