ds= randn( 20,30,40 )
print ds
from org.virbo.dataset import LengthsDataSet, DataSetUtil, JoinDataSet
print LengthsDataSet(ds)
print DataSetUtil.valueCount(ds)

ds= JoinDataSet(2)
ds.join( findgen(34 ) )
ds.join(  findgen(23 ) )
ds.join(  findgen(32 ) )
ds.join(  findgen(33 ) )

print LengthsDataSet(ds)
print DataSetUtil.valueCount(ds)