# [R] apply problem

Laurent Gautier laurent at genome.cbs.dtu.dk
Sun Mar 17 14:08:38 CET 2002

```On Sat, Mar 16, 2002 at 11:58:51PM -0500, ggrothendieck at yifan.net wrote:
>
> > data(iris)
>
> # iris3 is first 3 rows of iris
> > iris3 <- iris[1:3,]
>
> # z compares row 1 to each row of iris3 and is correctly
> computed
> > z <- c(F,F,F)
> > for(i in seq(z)) z[i] <- identical(iris3[1,],iris3[i,])
> > z
> [1]  TRUE FALSE FALSE
>
> # this should do the same but is incorrect
> > apply(iris3,1,function(x)identical(x,iris3[1,]))
>     1     2     3
> FALSE FALSE FALSE
>
> What's wrong here?
>
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Could this be because 'apply' expects an 'array' as input (try 'help(apply)') ?

Hopin' it helps,

Laurent

--
--------------------------------------------------------------
Laurent Gautier			CBS, Building 208, DTU
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```