[Rcpp-devel] rcpp sugar elementary question

[Bharath Govindarajan]

Thanks a lot. That helped.

Regards
Bharath

On Tue, Feb 19, 2013 at 10:53 AM, Romain Francois
<romain at r-enthusiasts.com>wrote:

> _ is defined in the Rcpp namespace, so perhaps you want to add :
>
> using namespace Rcpp ;
>
> somewhere on top.
>
> Also, you could use mat.row(1) instead of mat(1,_)
>
> Romain
>
> Le 19/02/13 16:49, Bharath Govindarajan a écrit :
>
>  Hi ,
>>
>> I am trying a simple example to assign entire rows to a
>> Rcpp::NumericMatrix. I read the Rcpp sugar document and looked at a few
>> online
>> examples. My simple code below produces errors:
>>
>>
>>   #include <iostream>
>>   #include <Rcpp.h>
>>
>> using std::cout;
>> using  std:endl;
>>
>> // [[Rcpp::export]
>>
>> void test()
>> {
>>       Rcpp::NumericMatrux mat(100,100);
>>       int rows = mat.nrow();
>>       int cols  = mat.ncol();
>>       cout << "rows " << rows << endl;
>>       cout << "cols " << cols << endl;
>>        Rcpp::NumericVector row2 = mat(1,_);
>>       cout << "mat(1,_) " << row2 << endl;
>>
>>
>>
>> }
>>
>>
>> Error:   error: '_' was not declared in this scope
>>
>> Thank you
>> Bharath
>>
>
>
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