[R] Equality of Vectors

[Dimitris Rizopoulos]

have a look at function all() but also at function all.equal() -- for 
your example,

x1 <- c(1,2,3)
x2 <- c(1,2,3)
x3 <- c(1,2,5)

all(x1 == x2)
all(x1 == x3)

# this safer
isTRUE(all.equal(x1, x2))
isTRUE(all.equal(x1, x3))


I hope it helps.

Best,
Dimitris


On 8/13/2010 8:49 PM, Downey, Patrick wrote:
> Hello,
>
> Is there a way to get a single TRUE or FALSE statement from comparing two
> vectors? For example,
> c(1,2,3) == c(1,2,3)
> produces
> TRUE TRUE TRUE
>
> where I would like it to produce only
> TRUE
> for use in an if statement.
>
> Likewise, when two vectors are not exactly identical (in all elements) I
> would like a single FALSE result, as opposed to
> c(1,2,3) == c(1,2,5)
> TRUE TRUE FALSE
>
> Any ideas?
>
> Thanks,
> Mitch
>
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

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