[Rcpp-devel] Fwd: Calling R function in Rcpp returns compatibility issues

[Sharat]

Thanks James for the quick reply.

Here you go:

[image: Inline image 1]

On Thu, Jul 27, 2017 at 9:14 AM, Balamuta, James Joseph <
balamut2 at illinois.edu> wrote:

> Greetings and Salutations Sharat,
>
>
>
> Could you supply some test data?
>
>
>
> Sincerely,
>
>
>
> JJB
>
>
>
> *From:* rcpp-devel-bounces at lists.r-forge.r-project.org [mailto:
> rcpp-devel-bounces at lists.r-forge.r-project.org] *On Behalf Of *Sharat
> *Sent:* Thursday, July 27, 2017 8:31 AM
> *To:* rcpp-devel at lists.r-forge.r-project.org
> *Subject:* [Rcpp-devel] Fwd: Calling R function in Rcpp returns
> compatibility issues
>
>
>
> Hi:
>
>
>
> I'm trying to call a R function (that compares strings) in Rcpp and return
> the result to make the comparisons run faster. Am a noob with Rcpp; so
> please bear. The input to the R function is a matrix of 2 columns.
>
>
>
> The error is: *Error in getGoing(product) : Not compatible with STRSXP:
> [type=NULL]. *
>
>
>
> Please assist.
>
>
>
> #include<Rcpp.h>
>
> using namespace Rcpp;
>
>
>
> /*** R
>
> comps= function(vec)
>
> {
>
>   streets <- vec
>
>   cnt <- nrow(streets)
>
>   res <- c()
>
>   print(paste0("Comparing ", (cnt)," pairs..."))
>
>
>
>   for (i in 1:cnt)
>
>   {
>
>     matched <- TRUE
>
>     prop1 = streets[i,1]
>
>     prop2 = streets[i,2]
>
>
>
>     prop1_parts = strsplit(trimws(prop1), ' ')
>
>     prop2_parts = strsplit(trimws(prop2), ' ')
>
>
>
>     prop1_parts_count = length(prop1_parts[[1]])
>
>     prop2_parts_count = length(prop2_parts[[1]])
>
>
>
>     if (prop1_parts_count == prop2_parts_count)
>
>     {
>
>       for (x in 1:prop1_parts_count)
>
>       {
>
>         part1 = prop1_parts[[1]][x]
>
>         part2 = prop2_parts[[1]][x]
>
>
>
>         if (part1 == part2) {
>
>             matched = matched & TRUE
>
>         }
>
>         else if (adist(part1, part2, partial = T)==0 | adist(part2,part1,
> partial = T)==0){
>
>             matched = matched & TRUE
>
>         }
>
>         else {
>
>           matched = matched & FALSE
>
>           break
>
>         }
>
>       }#forloop ends
>
>
>
>       if(matched){
>
>         append(res,paste(prop1,"<-->", prop2))
>
>       }
>
>     }#if loops ends
>
>   }#primary for loops ends
>
>   res
>
> }#function ends
>
> */
>
>
>
> // [[Rcpp::export]]
>
> Rcpp::StringMatrix getGoing(Rcpp::StringVector vec){
>
>   Rcpp::Environment env = Rcpp::Environment::global_env();
>
>   Rcpp::Function f = env["comps"];
>
>   Rcpp::StringMatrix result = f(vec);
>
>   return result;
>
> }
>
>
>
>
>
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