Rcpp Version 0.12.12
convolve10_cpp.cpp
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1 // -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
2 
3 // this version expands convolve8_cpp by making Vec mimic the structure of
4 // NumericVector. It peforms well, so this is is not the structure of
5 // NumericVector that is the problem. So what is it then ?
6 //
7 // could it be because NumericVector is in a different library than
8 // this code, so that operator[] is not inlined ?
9 //
10 // clues:
11 // - http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka3538.html
12 
13 #include <Rcpp.h>
14 
15 #include "convolve10_cpp.h"
16 
17 RcppExport SEXP convolve10cpp(SEXP a, SEXP b){
18  Rcpp::NumericVector xa(a);
19  Rcpp::NumericVector xb(b);
20  int n_xa = xa.size() ;
21  int n_xb = xb.size() ;
22  int nab = n_xa + n_xb - 1;
23  Rcpp::NumericVector xab(nab);
24 
25  Vec vab(xab.begin()), va(xa.begin()), vb(xb.begin()) ;
26 
27  for (int i = 0; i < n_xa; i++)
28  for (int j = 0; j < n_xb; j++)
29  vab[i + j] += va[i] * vb[j];
30 
31  return xab ;
32 }
33 
34 #include "loopmacro.h"
36 
#define LOOPMACRO_CPP(name)
Definition: loopmacro.h:12
#define RcppExport
Definition: RcppCommon.h:129
R_xlen_t size() const
Definition: Vector.h:274
RcppExport SEXP convolve10cpp(SEXP a, SEXP b)
iterator begin()
Definition: Vector.h:332