convolve12_cpp.cpp

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
 
// This is a rewrite of the 'Writing R Extensions' section 5.10.1 example
 
#include <Rcpp.h>
 
RcppExport SEXP convolve12cpp(SEXP a, SEXP b){
    Rcpp::NumericVector xa(a), xb(b);
    int n_xa = xa.size(), n_xb = xb.size();
    Rcpp::NumericVector xab(n_xa + n_xb - 1);
 
    typedef Rcpp::NumericVector::iterator vec_iterator ;
    vec_iterator ia = xa.begin(), ib = xb.begin();
    vec_iterator iab = xab.begin();
    for (int i = 0; i < n_xa; i++)
        for (int j = 0; j < n_xb; j++)
            iab[i + j] += ia[i] * ib[j];
 
    return xab;
}
 
#include "loopmacro.h"
LOOPMACRO_CPP(convolve12cpp)