[Rcpp-devel] Manipulation of IntegerVector

[Sameer D'Costa]

On Fri, Jul 11, 2014 at 3:19 AM, Mario Deng <mariodeng at googlemail.com>
wrote:

>

But when I do "matched[j+1] = matched[j]+1;" everything crashes, I don't
> get any error informations etc. Also, is there a way to avoid that the R
> instance/RStudio crashes?
>

I was able to compile and run part of your code on linux outside R Studio.
I did not get any problems with the indexing into the matched variable even
when I changed "matched[j+1] = matched[j] + 1".

I did however get an index error on the line right after. It is where you
set the names variable. After I commented out that line the error goes
away.


>
> // [[Rcpp::export]]
> List createVectorList_Numeric_cpp(NumericMatrix df) {
>   CharacterVector rownames = VECTOR_ELT(df.attr("dimnames"), 0);
>   CharacterVector colnames = VECTOR_ELT(df.attr("dimnames"), 1);
>   // Check Dimnames
>   if (df.nrow() != rownames.size() ) {
>     throw Rcpp::exception("Dimensions and corrosponding names differ in
> length");
>   }
>   List vectorList(df.ncol());
>   for(int i = 0; i < df.ncol(); i++){
>     NumericVector sorted_vec = df(_,i);
>     sorted_vec=sorted_vec.sort();
>     NumericVector one_col = df(_,i);

    IntegerVector matched = match(sorted_vec, one_col);
>     for(int j = 0; j < (matched.size() - 1); j++){
>       if( matched[j] >= matched[j+1] ){
>         const int tmp = matched[j]+1;
>         matched[j+1] = tmp;
>       }
>     }
>

I had to comment out the line below to avoid an index error. I'm using Rcpp
0.11.2

>     sorted_vec.attr("names")=rownames[matched-1];

    vectorList[i]=sorted_vec;
>   }
>   vectorList.attr("names") = colnames;
>   CharacterVector classIDs = CharacterVector::create("VectorList", "list");
>   vectorList.attr("class") = classIDs;
>   return vectorList;
> }
>
>
Cheers,
Sameer
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