Well, first of all, seq(from=.2,to=.3) gives c(0.2), so I assume you
really mean something like seq(from=.2,to=.3,by=.1), which gives
c(0.2, 0.3).
%in% tests for exact equality, which is almost never a good idea with
floating-point numbers.
You need to define what exactly you mean by "in" for floating-point
numbers. What sort of tolerance are you willing to allow?
Some possibilities would be for example:
approxin <- function(x,list,tol) any(abs(list-x)<tol) # absolute tolerance
rapproxin <- function(x,list,tol) (x==0 && 0 %in% list) ||
any(abs((list-x)/x)<=tol,na.rm=TRUE)
# relative tolerance; only exact 0 will match 0
Hope this helps,
-s
On Mon, Mar 16, 2009 at 9:36 AM, Daniel Murphy <chiefmur...@gmail.com> wrote:
> Hello:I am trying to match the value 0.3 in the sequence seq(.2,.3). I get
>> 0.3 %in% seq(from=.2,to=.3)
> [1] FALSE
> Yet
>> 0.3 %in% c(.2,.3)
> [1] TRUE
> For arbitrary sequences, this "invisible .3" has been problematic. What is
> the best way to work around this?
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