[R] compute differences

[Henrique Dallazuanna]

Try this:

data.frame(ID = apply(expand.grid(x$ID, x$ID), 1, paste, collapse =
'-'), diff = c(outer(x$val, x$val, '-')))

On Mon, Sep 21, 2009 at 9:39 AM, alessandro carletti <alxmilton at yahoo.it> wrote:
> Hi,
> I have a problem.
> I have a data frame looking like:
>
> ID val
>
> A  .3
> B  1.2
> C  3.4
> D  2.2
> E  2.0
>
> I need to CREATE the following TABLE:
>
> CASE   DIFF
>
> A-A    0
> A-B    -0.9
> A-C    -3.1
> A-D    -1.9
> A-E    -1.7
> B-A    ...
> B-B    ...
> B-C
> B-D
> B-E
> C-A
> C-B
> C-C
> C-D
> C-E
> D-A
> D-B
> D-C
> D-D
> D-E
> E-A
> E-B
> E-C
> E-D
> E-E
>
> WHERE CASE IS THE COUPLE OF ELEMENTS CONSIDEREDM AND DIFF IS THE computed DIFFERENCE between their values.
>
> Could you give me suggestions?
>
> Alessandro Carletti
>
>
>
>
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>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O