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Minimal Entropy Partitioning

Hi I am trying to discretize some continuos attributes using MinimalEntropyPartitioning. The process fails with a "Null Pointer exception" message, activating debug mode gives the following:
Exception: java.lang.NullPointerException
Message: null
Stack trace:

com.rapidminer.operator.preprocessing.discretization.MinimalEntropyDiscretization.createPreprocessingModel(MinimalEntropyDiscretization.java:79)
com.rapidminer.operator.preprocessing.PreprocessingOperator.apply(PreprocessingOperator.java:63)
com.rapidminer.operator.Operator.apply(Operator.java:664)
com.rapidminer.operator.OperatorChain.apply(OperatorChain.java:377)
com.rapidminer.operator.Operator.apply(Operator.java:664)
com.rapidminer.Process.run(Process.java:612)
com.rapidminer.Process.run(Process.java:582)
com.rapidminer.Process.run(Process.java:572)
com.rapidminer.gui.ProcessThread.run(ProcessThread.java:61)

Any clues on where the problem is?

Thanx

Ignacio

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IngoRM

Hi Ignacio,

could it be that all attributes were removed from the example set since they were discretized into a single bin? In that case, you could try to deactivate "remove_useless".

Cheers,
Ingo