[R] Challenge extracting months

Kwesi Quagraine starskykwesi at gmail.com
Mon Jan 30 13:53:34 CET 2017

Hello, I have a data with two variables nodes and index, I want to extract
3 months seasons, with a shift of 1 month, that is, DJF, JFM, FMA etc to
OND. Was wondering how to go about it. Kindly find attached the data as csv.
Any help will be appreciated.


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