HI,

Try this:
mapply(`+`, as.data.frame(x), as.data.frame(y))

You are using matrices, which are vectors with dim attributes, then you need
convert to data.frame

On Sat, Sep 5, 2009 at 1:16 PM, Peng Yu <pengyu.ut@gmail.com> wrote:

> Hi,
>
> I tried the following code. For example, I want to add the
> corresponding rows of x and y. I expect that the result be a matrix of
> the same size. But the actual result is different from what I expect.
> Would you please let me know what the correct command should be?
>
> Regards,
> Peng
>
> > x=matrix(1:6,nr=2)
> > y=matrix(1:6,nr=2)
> > mapply(function(u,v){u + v},x,y)
> [1]  2  4  6  8 10 12
>
>
> On Sat, Sep 5, 2009 at 10:59 AM, Henrique Dallazuanna<wwwhsd@gmail.com>
> wrote:
> > Yes, see mapply.
> >
> > On Sat, Sep 5, 2009 at 12:18 PM, Peng Yu <pengyu.ut@gmail.com> wrote:
> >>
> >> Hi,
> >>
> >> I am wonder if there is a function similar 'apply' but it could accept
> >> multiple arguments?
> >>
> >> For example, I have the following matrix.
> >> x=matrix(1:6,nr=2)
> >> y=matrix(1:6,nr=2)
> >>
> >> I want to find a function that can be used to compute the linear
> >> regression for each pair of rows in the two matrices?
> >>
> >> multiple_apply(x,y,1,function(u,v){lm(u ~ v)}
> >>
> >> That is, I wound like something like the above to compute the
> >> following. Can somebody let me know if there is such an command in R?
> >>
> >> lm(x[1,]~y[1,])
> >> lm(x[2,]~y[2,])
> >>
> >> Regards,
> >> Peng
> >>
> >> ______________________________________________
> >> R-help@r-project.org mailing list
> >> 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.
> >
> >
> >
> > --
> > Henrique Dallazuanna
> > Curitiba-Paraná-Brasil
> > 25° 25' 40" S 49° 16' 22" O
> >
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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.
>



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

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