[R] sample

[Jean Eid]

It seems that sample picks columns when the object is turned into a
data.frame. I do not knoe why it is doing that....

Is this something that was meant and not documented or something?


Jean


On Fri, 11 Feb 2005, Adaikalavan Ramasamy wrote:

> See below.
>
> On Thu, 2005-02-10 at 14:53 -0800, T. Murlidharan Nair wrote:
> > Just to explain my previous mail, here is the output I get.
> >
> >
> >  > dim(tissue.exp)
> > [1] 1532   20
>
> What is this object ? Try class(tissue.exp)
>
> >  > pick<-sample(tissue.exp,5,replace=TRUE)
> >  > dim(pick)
> > [1] 1532    5
>
> >From help(sample) :
>
>     sample(x, size, replace = FALSE, prob = NULL)
>
>     x: Either a (numeric, complex, character or logical) vector of
>        more than one element from which to choose, or a positive
>        integer.
>
> x has to be a vector or positive integer integer. I am not sure how you
> got "sample" to work on tissue.exp in the first place. Maybe you got
> your own version of "sample".
>
>
> >  > tissue.exp.t<-t(tissue.exp)
> >  > dim(tissue.exp.t)
> > [1]   20 1532
> >  > pick<-sample(tissue.exp.t,5,replace=TRUE)
> >  > dim(pick)
> > NULL
> >
> > --------
> > Thanks ../Murli
> >
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>
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