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# pandas.Panel4D.apply

`Panel4D.``apply`(func, axis='major', **kwargs)

  Applies function along input axis of the Panel

  Parameters : | func : function Function to apply to each combination of ‘other’ axes e.g. if axis = ‘items’, then the combination of major_axis/minor_axis will be passed a Series axis : {‘major’, ‘minor’, ‘items’} Additional keyword arguments will be passed as keywords to the function
  Returns : | result : Pandas Object

  Examples

      >>> p.apply(numpy.sqrt) # returns a Panel
      >>> p.apply(lambda x: x.sum(), axis=0) # equiv to p.sum(0)
      >>> p.apply(lambda x: x.sum(), axis=1) # equiv to p.sum(1)
      >>> p.apply(lambda x: x.sum(), axis=2) # equiv to p.sum(2)

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