From: Marc Schwartz (via MN) <mschwartz_at_mn.rr.com>

Date: Wed 17 Aug 2005 - 04:08:24 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Aug 17 04:21:18 2005

Date: Wed 17 Aug 2005 - 04:08:24 EST

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

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Aug 17 04:21:18 2005

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