Hi,
The new Rcpp::DataFrame follows R's tradition and automatically converts
character vectors into factors:
> fun <- cppfunction( signature(), '
+ IntegerVector v = IntegerVector::create(1,2,3);
+ std::vector<std::string> s(3);
+ s[0] = "a";
+ s[1] = "b";
+ s[2] = "c";
+ return DataFrame::create(Named("a")=v, Named("b")=s);
+ ' )
> fun()
a b
1 1 a
2 2 b
3 3 c
> fun()[["b"]]
[1] a b c
Levels: a b c
Is this good or bad ? I think it is bad as we don't have a way to turn
this off... we can set the options( "stringsAsFactors" ) to FALSE
Should we allow something like this:
DataFrame::create(
_["x"] = v ,
_["y"] = s,
_["stringsAsFactors"] = false )
or maybe have a variable like this to pilot the option:
static bool DataFrame::stringsAsFactors = false ;
Romain
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Romain Francois
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http://romainfrancois.blog.free.fr
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