"DBSCAN Error: IndexoutofBoundexception"

shadrigoshadrigo Member Posts: 9 Contributor II
edited May 2019 in Help

I am not very familiar with rapidminer(yet!!) so I hope my problem is just a failure of a beginner who hasn´t found where to find the
right solution or gets a feeling for the error source.

I want to use DBSCAN Clustering in order to cluster image histograms with values for each Bin between 0.0 and 100 %.
My example source is an arff File.
The process is set up with the examplesource and then follows a NominalAttributeFilter before the exampleset is put into
I get an IndexOutOfBoundsException failure with the Message "IndexOutOfBoundsException caught: Index: 0 , Size: 0".

In Weka I don´t get such an error, so I think my example data seems to be valid.
Any suggestions? Thank you in advance!


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    landland RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 2,531 Unicorn
    unfortunatly you are right. There was a small bug, causing this exception if the parameters have been set to values which result in classifying all examples as noise.
    This is now fixed in the repository (head). Nevertheless no sensefull results will be delivered, since every example is classified as noise.

    DBScan is one of the most instable clustering algorithms I have seen so far, so tuning of parameter epsilon is very important to get a usefull result.

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    shadrigoshadrigo Member Posts: 9 Contributor II
    thanks for your answer.

    I will check out from the repository and try again but will consider your further hints on dbscan so that I play a little bit with the parameters but
    perhaps look for an alternative for clustering.

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