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
recategorizing a vector into discrete states
3 messages · Allan Strand, Achim Zeileis, Marc Schwartz (via MN)
On Tue, 16 Aug 2005 13:18:23 -0400 Allan Strand wrote:
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.
cut(a, c(b, Inf), labels = b) which returns a factor. Z
cheers, Allan Strand
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On Tue, 2005-08-16 at 13:18 -0400, Allan Strand wrote:
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
See ?cut
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)
cut(a, c(b, Inf), labels = b, right = FALSE)
[1] 0 8 0 2 4 4 6 8 2 4 Levels: 0 2 4 6 8 Note that cut() returns a factor. HTH, Marc Schwartz