Hello
I need some help to get started with using Pig UDF.
I have time series data (time, magA, errA, magB, errB) e.g.
(2345.59777,19.875,0.481,20.225,0.482)
(2347.59568,19.371,0.3,20.227,0.743)
(2351.6075,19.063,0.193,20.768,1.085)
(2354.59702,20.689,3.047,20.873,1.758)
(2356.63223,21.23,3.341,20.562,1.242)
and I need to apply an algorithm that searches for periods in the
data. The input to the algorithm is the (time , magX, errX )
arrays. The algo returns a List of all periods found. Each entry in
the List is a (period_value , period_significance) pair.
How can I wrap that algo as UDF ? do I have to use algebraic
functions (but I saw that they could only return scalar values ); what
I need to return from function is something like
(1000.0,0.57)
(234, .45)
(100, 0.023)
(6, 0.003)
thanks a lot
