less than negative in R

Question

How can I compare a column in data frame for range? The range is like less than a negative number and greater than a positive number. For Positive number there is no problem but for negative number it is taking it as an assignment operator.Code for reference is given below

Resited<-Reap[mean < -5 & mean > 5,]

Do you mean `Resited 5, ]`? Otherwise it doesn't make much sense — David Arenburg, Dec 16 '14 at 21:00
This is either due to a typo or a complete misunderstanding of a logical-AND. Either way it should be closed as not reproducible or user-error (in thinking). — IRTFM, Dec 16 '14 at 21:57
it keeps throwing the error "Error in mean < -5 : comparison (3) is possible only for atomic and list types" — Kaushal, Dec 17 '14 at 14:51

score 4 · Answer 1 · edited Dec 16 '14 at 20:59

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"mean" cannot be less than -5 and more than 5 at the same time. Did you mean logical OR? If both abs values are the same, you could simply write

Resited <- Reap[abs(mean) > 5, ]

edited Dec 16 '14 at 20:59

David Arenburg

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answered Dec 16 '14 at 20:40

Alexey Ferapontov

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fails if asymmetric as others have noted – Carl Witthoft Dec 16 '14 at 21:44
True. I simply used topic-starter's numbers as an example. – Alexey Ferapontov Dec 16 '14 at 21:54

score 3 · Answer 2 · answered Dec 16 '14 at 21:30

3

This simplest way in my opinion is just to put parentheses around your negative value:

Resited<-Reap[mean<(-5) | mean>5,]

answered Dec 16 '14 at 21:30

CephBirk

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Hans Roggeman · Answer 3 · 2014-12-16T21:11:50.180

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For the case where your range is not symmetric around zero, R allows you to define your own operators:

`%between%` = function(x,range) x>range[1] & x<range[2]
-6 %between% c(-7,-2)
[1] TRUE

edited Dec 16 '14 at 21:11

answered Dec 16 '14 at 21:06

Hans Roggeman

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This would appear not to answer the question asked, but could easily be modified to do so: `x>range[1] | x – Carl Witthoft Dec 16 '14 at 21:43

less than negative in R

3 Answers3