Sequence reduction in R

Posted by drknexus on Stack Overflow See other posts from Stack Overflow or by drknexus
Published on 2010-06-09T23:51:23Z Indexed on 2010/06/10 0:12 UTC
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r

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sequence

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sequences

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reduction

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repetition

Assume you have a vector like so:

v <- c(1,1,1,2,2,2,2,1,1,3,3,3,3)

How can it be best reduced to a data.frame like this?

v.df <- data.frame(value=c(1,2,1,3),repetitions=c(3,4,2,4))

In a procedural language I might just iterate through a loop and build the data.frame as I go, but with a large dataset in R such an approach is inefficient. Any advice?

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Developer IT

Sequence reduction in R - Developer IT

Sequence reduction in R

r

sequence

sequences

reduction

repetition

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