[Rcpp-devel] type information about elements in Rcpp::List

[Chaomei Lo]

Hi, Romain,

Thanks a lot for the quick reply !!
Suffix with << L >> works for me for both Rf_isInteger and is<int>.


On Mon, Jun 9, 2014 at 12:43 PM, Romain François <romain at r-enthusiasts.com>
wrote:

>
> Le 9 juin 2014 à 21:40, Chaomei Lo <chaomeilo at gmail.com> a écrit :
>
> >
> > I have a R list something like this -
> >
> > op=list(a=200, b="test", c=4.5)
> > when I pass it as an argument to Rcp Export function which the code
> looks like this in below.
> >
> > ----------------------------------------
> > int n = xlist.length();
> > for (int I=0; I < n; I++) {
> >   SEXP s = xlist[I];
> >   if (Rf_isInteger(s)) {
> >   //do something
> >   }
> >   else if (Rf_isNumerc(s)) {
> >   //do other thing
> >   }
> >   else if (Rf_isString(s)) {
> >   //do other thing
> >   }
> > }
> >
> > However, both a and c go to the Rf_isNumeric if statement; but the first
> one is an integer,
>
> no it’s not.
>
> > str( 200 )
>  num 200
> > str( 200L )
>  int 200
> > str( as.integer(200) )
>  int 200
>
> Suffix with « L » or use as.integer if you want an integer.
>
> Alternatively, Rcpp has is<>, so you can use
>
> if( is<int>(s) ) {
>     ...
> }
>
> Romain
>
> > not sure why it did not go to into the Rf_isInteger if statement.
> >
> > Thanks.
>
>
>
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