def cross_above(values1, values2, start=(-2), end=None):
 return _cross_impl(values1, values2, start, end, (lambda x: (x > 0)))

def cross_above ( values1 , values2 , start = ( - 2 ) , end = None ) : return _cross_impl ( values1 , values2 , start , end , ( lambda x : ( x > 0 ) ) )
checks for a cross above conditions over the specified period between two dataseries objects .