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    <p><code>body</code> is for the body of the function, you want to look at the <code>includes</code> argument of <code>cxxfunction</code>: </p> <pre><code>library(inline) library(Rcpp) a = 1:10 cpp.fun = cxxfunction(signature(data1="numeric"), plugin="Rcpp", body=' IntegerVector fun_data = data1; int n = fun_data.size(); for(int i=0;i&lt;n;i++){ fun_data[i] = fun1(fun_data[i]); } return(fun_data); ', includes = ' int fun1( int a1){ int b1 = a1; b1 = b1*b1; return(b1); } ' ) cpp.fun( a ) </code></pre> <p><code>?cxxfunction</code> has detailed documentation about its <code>includes</code> argument. </p> <p>But note that this version will make in place modifications in your input vector, which is probably not what you want. Another version that also takes advantage of <code>Rcpp</code> version of <code>sapply</code>: </p> <pre><code>library(inline) library(Rcpp) a = 1:10 cpp.fun = cxxfunction(signature(data1="numeric"), plugin="Rcpp", body=' IntegerVector fun_data = data1; IntegerVector out = sapply( fun_data, fun1 ) ; return(out); ', includes = ' int fun1( int a1){ int b1 = a1; b1 = b1*b1; return(b1); } ' ) cpp.fun( a ) a </code></pre> <p>Finally, you definitely should have a look at <code>sourceCpp</code>. With it you would write your code in a <code>.cpp</code> file, containing: </p> <pre><code>#include &lt;Rcpp.h&gt; using namespace Rcpp ; int fun1( int a1){ int b1 = a1; b1 = b1*b1; return(b1); } // [[Rcpp::export]] IntegerVector fun(IntegerVector fun_data){ IntegerVector out = sapply( fun_data, fun1 ) ; return(out); } </code></pre> <p>And then, you can just <code>sourceCpp</code> your file and invoke the function :</p> <pre><code>sourceCpp( "file.cpp" ) fun( 1:10 ) # [1] 1 4 9 16 25 36 49 64 81 100 </code></pre>
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    1. COThank you for the tip.
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    2. COSure. Welcome on Stack Overflow. Please upvote and accept this answer if it suits you. (visit http://stackoverflow.com/faq if you don't know what I mean)
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