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Mon Nov 22 12:45:25 CET 2010


    Rcpp::NumericMatrix M(n,n);

    for (int i=0; i<n; i++) {

        for (int j=0; j<n; j++) {

            M(i,j) = i*10+j;

        }

    }

 

But for Rcpp::DataFrame,  I only see constructor using SEXP, which to my
understanding,  is to pass data back from R to C++. 

Ideally, I would expect to be able to define C++ data structure for
data.frame's row and use vector<row_structure>  to construct
Rcpp::DataFrame. 

 

Thx. 

-Wei

 

 

 


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<p class=3DMsoNormal>Sorry I am really new to this. &nbsp;So it might be =
a silly
question. <o:p></o:p></p>

<p class=3DMsoNormal>I would like to know if it is possible to create
Rcpp::DataFrame in C++ and pass it to R. <o:p></o:p></p>

<p class=3DMsoNormal>From example code, I can see for NumericMatrix, I =
can do
something like: <o:p></o:p></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>&nbsp;&nbsp;&nbsp; Rcpp::NumericMatrix =
M(n,n);<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>&nbsp;&nbsp;&nbsp; </span><b><span =
style=3D'font-size:10.0pt;
font-family:"Courier New";color:#9C20EE'>for</span></b><span =
style=3D'font-size:
10.0pt;font-family:"Courier New";color:black'> (</span><span =
style=3D'font-size:
10.0pt;font-family:"Courier New";color:#208920'>int</span><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:black'> i=3D0; =
i&lt;n;
i++) {<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><b><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#9C20EE'>for</span></b><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:black'> =
(</span><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:#208920'>int</span><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:black'> j=3D0; =
j&lt;n;
j++) {<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;
M(i,j) =3D i*10+j;<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
}<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:black'>&nbsp;&nbsp;&nbsp; }<o:p></o:p></span></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>But for Rcpp::DataFrame, &nbsp;I only see =
constructor using
SEXP, which to my understanding,&nbsp; is to pass data back from R to =
C++. <o:p></o:p></p>

<p class=3DMsoNormal>Ideally, I would expect to be able to define C++ =
data structure
for data.frame&#8217;s row and use vector&lt;row_structure&gt;&nbsp; to =
construct
Rcpp::DataFrame. <o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>Thx. <o:p></o:p></p>

<p class=3DMsoNormal>-Wei<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

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