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From Suneel Marthi <>
Subject Re: Synthetic control dataset clustering { Doubt Reg Cardinality }
Date Wed, 11 Jan 2012 10:52:41 GMT
a) It would help if you could post the exception stacktrace.

b) CardinalityException is thrown when their is a cardinality mismatch when performing vector
or matrix operations.  For a KMeans driver this is usually thrown when computing the Distance
Measure when your feature vectors for whom the distance is being computed are both of differing

 From: rahul raghavendhra <>
Sent: Wednesday, January 11, 2012 4:39 AM
Subject: Synthetic control dataset clustering { Doubt Reg Cardinality }
Hi all, i have run that
org.apache.mahout.clustering.syntheticcontrol.<>.Job successfully.. when i
run with similar dataset(double values separated by ' ' (space))..

i got the error  org.apache.mahout.math.CardinalityException: Required
cardinality 16 but got 91

How this Cardinality is calculated and how it is passed  to kmeans driver..
how to calculate the cardinality for any dataset ?

please help

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