From: Duncan Murdoch <murdoch_at_stats.uwo.ca>

Date: Wed 01 Jun 2005 - 05:14:10 EST

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> <snippage>

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> It wouldn't help the original poster, though. I agree that 0,0,0,4,1,2,3

*> is a slightly weird result, but I can't think of any reasonable model for
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*> the behaviour of ifelse() that would give any other result except an error
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*> message. [or 0,NA,NA,4,NA,NA,NA, I suppose].
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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 Jun 01 05:17:51 2005

Date: Wed 01 Jun 2005 - 05:14:10 EST

Thomas Lumley wrote:

> On Tue, 31 May 2005, Duncan Murdoch wrote:

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>>Mäkinen Jussi wrote: >> >>>Dear All, >>> >>>I luckily found the following feature (or problem) when tried to apply >>>ifelse-function to an ordered data. >>> >>> >>> >>>>test <- c(TRUE, TRUE, TRUE, FALSE, FALSE, FALSE, FALSE) >>>>ifelse(test, 0, 1:4) >>> >>>[1] 0 0 0 4 1 2 3 >>>

> <snippage>

>>As Dimitris said, this is just recycling. I think getting rid of recycling >>on vectors with length greater than 1 would have been a good decision in S >>about 15 years ago, but it's too late now.

> It wouldn't help the original poster, though. I agree that 0,0,0,4,1,2,3

I would vote for the error message. I can't think of a single example where a vector of length 7 is needed, and a vector of length 4 is recycled to give it, that *doesn't* give a slightly weird result.

Maybe this is something that should have been changed in R 2.0.0; we squandered that change from 1.x.x to 2.x.x.

Duncan Murdoch

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 Jun 01 05:17:51 2005

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