[Rcpp-devel] Eigen-like pointer mappings in Rcpp?

[Yixuan Qiu]

Oops sorry, should be begin(). data() is the Eigen method.

Best,
Yixuan
On Feb 17, 2015 6:12 PM, "Sparapani, Rodney" <rsparapa at mcw.edu> wrote:

> On Tue, 2015-02-17 at 15:57 -0500, Yixuan Qiu wrote:
> > Hello Rodney,
> >
> > If all you need is to pass a pointer to the fit() function (assuming
> > fit() does not modify x) and get the result a, you do not need to make
> > a copy. Simply wrap _x by a NumericVector and call the data() method.
> >
> > Rcpp::NumericVector x(_x);
> >
> > double a = fit(x.data(), n);
> >
> > You can even directly use the R API without creating an Rcpp object.
> >
> > double a = fit(REAL(_x), n);
> >
> >
> > Best,
> >
> > Yixuan
>
> Hi Yixuan:
>
> That's exactly what I wanted!  However, I can't seem to find that method
> at http://dirk.eddelbuettel.com/code/rcpp/html
>
> Can you please point me to it?
>
> From this...
>
> Rcpp::NumericVector x(_x);
>
> double a = fit(x.data(), n);
>
> I get...
>
> error: class Rcpp::NumericVector has no member named data
>
> Am I doing something dumb?
>
> I'm using Rcpp 0.10.3 w/ 2.15.3 R and GCC 4.4.7 if it matters.
>
> Thanks,
>
> Rodney
>
>
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