[R] recategorizing a vector into discrete states

From: Allan Strand <stranda_at_cofc.edu>
Date: Wed 17 Aug 2005 - 03:18:23 EST


Hi All,

I'm trying to take a numerical vector and produce a new vector of the same length where each element in the first is placed into a category given by a 'breaks-like' vector. The values in the result should equal the lower bounds of each category as defined in the breaks vector.

  I suspect that a vectorized solution is pretty simple, but I can't seem to figure it out today. Here is an example of my problem:

Vector 'a' is the original vector. Vector 'b' gives the lower bounds of the categories. Vector 'c' is the result I am seeking.

a <- c(0.9, 11, 1.2, 2.4, 4.0, 5.0, 7.3, 8.1, 3.3, 4.5) b <- c(0, 2, 4, 6, 8)

c <- c(0, 8, 0, 2, 4, 4, 6, 8, 2, 4)

Any suggestions would be greatly appreciated.

cheers,
Allan Strand



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