[R] combining rows

[joonsum]

First time using R and have so many basic questions. 

The problem that I have confronted is combining rows. I have a data frame
that contains daily rain falls from 60 to 80. There are 27 columns which are
Year,month, day, and record in hours.

I am trying to combine the 4th column to the 27th to get daily rain fall
data. 
rowSums() works in the case of merging all rows but in my case, I need to be
selective. How should I start?  


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