R devel - May 2013 - Accessing i'th element of a vector without using a macro

Hello,

I have a double vector, x. I can access the i'th element as

REAL(x)[i]

Is there a function for this? I know i can write my own, but was
seeing if one already exists. I did check Rinternals.h but didn't see
one.

Cheers
Saptarshi

Saptarshi,

When I need to repeatedly access data from a an R vector in C I typically
just create a pointer to the data and just use that.

double *xdat = REAL(x);
xdat[i]; //repeat as necessary

This is also displayed in 5.9.4 of the R extensions manual.

Is there a reason this wouldn't work for your usecase? What exactly is it
that you want to do?

~G




On Mon, May 20, 2013 at 9:56 AM, Saptarshi Guha
<saptarshi.guha@gmail.com>wrote:
> Hello,
>
> I have a double vector, x. I can access the i'th element as
>
> REAL(x)[i]
>
> Is there a function for this? I know i can write my own, but was
> seeing if one already exists. I did check Rinternals.h but didn't see
> one.
>
> Cheers
> Saptarshi
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>


-- 
Gabriel Becker
Graduate Student
Statistics Department
University of California, Davis

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