Re: [R] conditional less than

[Spencer Graves]

Putting -0.01 in parenthesis works for me.  Consider the following: 

> DF <- data.frame(a=c(-2,2), b=3:4)
> DF[DF$a<(-1),]
  a b
1 -2 3
However, if I first do it without parentheses, then I've changed DF 
before I attempt to subset it: 

DF[DF$a<-0.01,]
[1] a b
<0 rows> (or 0-length row.names)
> DF
    a b
1 0.01 3
2 0.01 4
This can create other problems, because now length(DF$a) == 1 (even 
though it printed as length 2): 

> DF[DF$a<-1,]
    a b
1 0.01 3
hope this helps.  spencer graves

Brian J. Haag wrote:

I'm sure this is a total noob question, but half an
hour of searching bore no fruit: How do you select a
subset of a vector by negative value?  If I try
 

hist(sp$p[sp$r>0.01])   # all is well
hist(sp$p[sp$r<-0.01])  # this obviously causes
   

issues

Also, putting -0.01 in parentheses didn't help.

Thanks in advance --

b

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