[R] (no subject)

[Bert Gunter]

Jeremie's suggestion of course will fail if some of the off-diagonal
elements are the same as those on the diagonals.

The request doesn't make a lot of sense to me, but if "m" is the matrix,

 m[row(z) != col(z)]

reliably extracts the vector of non-diagonal entries, which can then be
dimensioned as desired.
Or upper.tri() and lower.tri() can be used to separately extract the upper
and lower triangle entries via logical indexing.

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Sat, Oct 20, 2018 at 8:48 AM Jeremie Juste <jeremiejuste using gmail.com>
wrote:

>
>
> Hello,
>
> Be sure to include the mailing list,<r-help using r-project.org> when you
> reply. In this way to improve your chances of obtaining a good answer
> and everyone benefits.
>
>
> May be something like this ?
>
> aa <- matrix(1:9,3,3)
> matrix(as.numeric(aa)[!as.numeric(aa) %in% diag(aa)],2,3)
>
>      [,1] [,2] [,3]
> [1,]    2    4    7
> [2,]    3    6    8
>
> Hope it helps,
>
> Jeremie
>
> malika yassa <yassa_malika using yahoo.fr> writes:
>
> >  hellow
> > yes i want to extract the non-diagonal part
> > for exampl
> > i have this matrix  [,1] [,2] [,3]
> > [1,]    1    4    7
> > [2,]    2    5    8
> > [3,]    3    6    9the result
> >
> >   [,1] [,2] [,3]
> > [1,]    2    4    7
> > [2,]    3    6    8
> >
> >     Le samedi 20 octobre 2018 à 15:21:53 UTC+2, Jeremie Juste <
> jeremiejuste using gmail.com> a écrit :
> >
> >  malika yassa via R-help <r-help using r-project.org> writes:
> >
> > Hello,
> >
> > Can you specify what you mean by deleting exactly?
> > Do you want to have zero in the diagonal or do you want to extract the
> > non-diagonal part?
> >
> > Besides your matrix is not a square matrix. Do you really want to
> > extract the non-diagonal part of a non square matrix?
> >
> > Best regards,
> >
> > Jeremie
> >
> >> hellowplease,do you help mei have this matrixm<-matrix(( 1:12, nrow = 3
> )
> >>
> >> I want to delete the diagonal values of this matrix
> >> can anyone do thisthinks
> >>
> >>     [[alternative HTML version deleted]]
> >>
> >> ______________________________________________
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> >> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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