ds= getDataSet( 'http://cdaweb.gsfc.nasa.gov/data/ace/mag/level_2_cdaweb/mfi_k0/2011/ac_k0_mfi_20111117_v01.cdf?BGSEc' )
result= magnitude( ds )

dep1= ds.property( 'DEPEND_1' )
ds2= pow( ds, 2 )
#ds2= total( ds2, 1 )
ds2= sqrt( ds2 )
ds2.putProperty(  'DEPEND_1', dep1 )

import org.virbo.dataset.DDataSet;

ds3= org.virbo.dataset.DDataSet.copy( ds );
ds3[:,:]= 1.