how to show entropy and purity?

Hi:
I run vcluto with a matix size 192*761,

the command line is : vcluser -clmethod=rb -sim=cos -crfun=i2 -cstype=best -rowmodel=none -colmodel=none -colprune=1.00 -ntrials=10 -niter=10 -clustfile=ClusterLabel.txt TFIDF.txt 13

The result dosen't show the entropy and the purity of each cluster, would you please tell me how to show them? Thanks a lot!