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An interesting thing that I found while doing the analysis for my previous post on the Canterbury earthquakes, was the difficulty of constraining figures less than a negative number. For example:

a<-seq(1, 10, 1)
b<-a[a>3 & a<7]
c<-seq(-1, -10, -1)
d<-c[c<-3 & c>-7]

> a
[1] 1 2 3 4 5 6 7 8 9 10
> b
[1] 4 5 6
> c
[1] TRUE TRUE TRUE TRUE TRUE TRUE FALSE FALSE FALSE FALSE
> d
[1] -1 -2 -3 -4 -5 -6

The boolean operator for selecting a range less than a negative number ends up being the same as the assignment operator. To get around this I simply define the function neg()

neg<-function(x) -x
c<-seq(-1, -10, -1)
d<-c[cneg(7)]

> c
[1] -1 -2 -3 -4 -5 -6 -7 -8 -9 -10
> d
[1] -4 -5 -6

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