[R] macro function

[mrzung]

I really appreciate to your attention.

I want to change the data form "A" into "B"


http://r.789695.n4.nabble.com/file/n4428807/1.png 


http://r.789695.n4.nabble.com/file/n4428807/2.png 


In fact, there are 1095 column in data "A". 
Specifically, variable "publish_day" is when some book in the same row is
published and 
"D-1", "D-2" means the term after the "publish day".
Of course, the cells in data mean productivity in the day.

What can be effecient way to do it?



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