[Rcpp-devel] Segfault problem when adding RcppFrame to RcppResultSet on gcc 4.1.2

2010-03-29 Thread R_help Help 
Hi,

I'm a bit puzzled. I uses exactly the same code in RcppExamples
package to try adding RcppFrame object to RcppResultSet. When running
it gives me segmentation fault problem. I'm using gcc 4.1.2 on redhat
64bit. I'm not sure if this is the cause of the problem. Any advice
would be greatly appreciated. Thank you.

Rob.


int numCol=4;
   std::vector colNames(numCol);
   colNames[0] = "alpha"; // column of strings
   colNames[1] = "beta";  // column of reals
   colNames[2] = "gamma"; // factor column
   colNames[3] = "delta"; // column of Dates
   RcppFrame frame(colNames);

   // Third column will be a factor. In the current implementation the
   // level names are copied to every factor value (and factors
   // in the same column must have the same level names). The level names
   // for a particular column will be factored out (pardon the pun) in
   // a future release.
   int numLevels = 2;
   std::string *levelNames = new std::string[2];
   levelNames[0] = std::string("pass"); // level 1
   levelNames[1] = std::string("fail"); // level 2

   // First row (this one determines column types).
   std::vector row1(numCol);
   row1[0].setStringValue("a");
   row1[1].setDoubleValue(3.14);
   row1[2].setFactorValue(levelNames, numLevels, 1);
   row1[3].setDateValue(RcppDate(7,4,2006));
   frame.addRow(row1);

   // Second row.
   std::vector row2(numCol);
   row2[0].setStringValue("b");
   row2[1].setDoubleValue(6.28);
   row2[2].setFactorValue(levelNames, numLevels, 1);
   row2[3].setDateValue(RcppDate(12,25,2006));
   frame.addRow(row2);

RcppResultSet rs;
rs.add("PreDF", frame);
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[Rcpp-devel] Using Rcpp in MS VC++

2010-05-27 Thread R_help Help 
Hi - I tried to start using Rcpp in MS VC++. As expected, with my
experience I can't get it to work. The compiled Rcpp.dll was compiled
with MinGW and the mangled name convention seem to be totally
different from MS VC++ convention. I also tried compiling the source
within VC++ myself. However, I have to ensure that I expose all
necessary functions, classes and members to the dll explicitly.

I'm wondering if there's any better way to get it to work in VC++? Any
suggestion is highly recommended. Thanks.

Rob
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[Rcpp-devel] Passing large data frame

2010-06-13 Thread R_help Help 
Hi,

I have a doubt regarding passing large data frame into Rcpp. If we
consider the following function

foo(SEXP myframe) {

RcppFrame &fr_ref = (RcppFrame &) myframe;
}

Somehow seems to work without a need to call a constructor and thus
causes copy of large data frame to RcppFrame object. However, you can
see that the code is not safe. there's no guarantee that myframe is a
data frame. This is my first question, is there any way to check type
of the input SEXP? Or is there any better way to do this?

Secondly, I'm wondering why the POSIXct column in my data frame
appears as double when I pass a data frame as an argument into a
function or when I read it out from global environment map? Is there
anyway to ensure it appears as RcppDatetime? Thank you.

Robert
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