[R] how to get column/row info from a dist object?

[Pedro Mardones]

Thanks Francisco;
I'm trying to avoid the step of converting a dist object into a matrix
because I'm working with matrices of more than 5000 rows x 5000
columns. I just was wondering if someone knew any trick to do that.

On 5/11/07, Francisco J. Zagmutt <gerifalte28 at hotmail.com> wrote:
> But the dist object is not structured with rows and columns.  i.e.
>
> x=1:4
>
> d=dist(x)
>   1 2 3
> 2 1
> 3 2 1
> 4 3 2 1
>
> str(d)
> Class 'dist'  atomic [1:6] 1 2 3 1 2 1
>   ..- attr(*, "Size")= int 4
>   ..- attr(*, "Diag")= logi FALSE
>   ..- attr(*, "Upper")= logi FALSE
>   ..- attr(*, "method")= chr "euclidean"
>   ..- attr(*, "call")= language dist(x = x)
>
> So, AFAIK if you want to get references for rows and columns you need to
> make it an object that indeed has rows and columns, i.e. a matrix.  See
> ?which to obtain the reference you want in a matrix.
>
> Regards,
>
> Francisco
>
>
> Pedro Mardones wrote:
> > Dear R users;
> >
> > Is it possible to get the row and column number of a particular entry
> > in a dist object?
> >
> > Let's say that I want to find the position of the value 1.1837 (the
> > last entry on the dist object below), that is [6,3]. Can I get those
> > values without transforming the object to a matrix?, i.e. working with
> > the dist object only.
> >
> >             1                2               3
> > 2  0.23935864
> > 3  0.56655914 0.71923104
> > 4  0.15272561 0.37926989 0.43931332
> > 5  0.17728654 0.13355685 0.73025495
> > 6  0.61783536 0.52055379 1.18374889
> >
> > Thanks for any idea
> > PM
> >
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>