code: def updatePotentialRadius(sp, newPotentialRadius):
    
    oldPotentialRadius = sp._potentialRadius
    sp._potentialRadius = newPotentialRadius
    numColumns = np.prod(sp.getColumnDimensions())
    for columnIndex in xrange(numColumns):
      potential = sp._mapPotential(columnIndex)
      sp._potentialPools.replace(columnIndex, potential.nonzero()[0])
  
    sp._updateInhibitionRadius()
docs: Change the potential radius for all columns
    :return: