a fix on min_threshold_distance function
a fix on min_threshold_distance function

schmidtc/pysal,pysal/pysal,chhao91/pysal,spreg-git/pysal,jlaura/pysal,hasecbinusr/pysal,sjsrey/pysal_core,sjsrey/pysal_core,badjr/pysal,sjsrey/pysal,jlaura/pysal,ljwolf/pysal,ljwolf/pysal_core,TaylorOshan/pysal,darribas/pysal,ljwolf/pysal_core,dfolch/pysal,TaylorOshan/pysal,dfolch/pysal,hasecbinusr/pysal,pastephens/pysal,lixun910/pysal,jlaura/pysal,pastephens/pysal,badjr/pysal,spreg-git/pysal,TaylorOshan/pysal,ljwolf/pysal,pastephens/pysal,pedrovma/pysal,nathania/pysal,darribas/pysal,nathania/pysal,lixun910/pysal,lixun910/pysal,lanselin/pysal,schmidtc/pysal,sjsrey/pysal_core,weikang9009/pysal,ljwolf/pysal,ljwolf/pysal_core,hasecbinusr/pysal,chhao91/pysal