[Rcpp-devel] Rcpp can not return big DataFrame

[该走了]

Dear Rcpp developer,
  I am tried return a big DataFrame from Rcpp to R, but met some problem!

### begin dataframetest.cpp

#include <Rcpp.h>
using namespace Rcpp;
using namespace std;

// [[Rcpp::export]]
DataFrame dataframetest(NumericVector close){
  int nrow = close.size();
  vector<double>  txn_qty = vector<double>(nrow);
  vector<double> txn_prc = vector<double>(nrow);
  vector<double>  txn_fee = vector<double>(nrow);
  vector<double>  pos_qty = vector<double>(nrow);
  vector<double>  close_prc = as<vector<double> >(close);
  vector<double>  PL = vector<double>(nrow);
  DataFrame PLrecord = DataFrame::create(Named("txn.qty", txn_qty),
 Named("txn.prc", txn_prc),
 Named("txn.fee", txn_fee),
 Named("pos.qty", pos_qty),
 Named("close.prc", close_prc),
 Named("PL", PL));
  return PLrecord;
}
#### end  dataframetest.cpp

### R code
n <- 4e5
x.prc <- 1:n
library(Rcpp)
sourceCpp("./dataframetest.cpp")
aa <- dataframetest(x.prc)

##### end R code

 When n is big, like 4e5, then it will exhaust the memory or crash; when n
is small, like  4e3, it can return the correct DataFrame. I was wondering
if Rcpp::DataFrame can handle so big DataFrame. In my opinion, n = 4e5 is
not big, I can create such a long data.frame from R code easily, without
any problem. Why Rcpp can not? Or I miss something?

### R code
n <- 4e5
x.prc <- rnorm(n)
a <- data.frame(x = x.prc,
        y = x.prc,
                d = x.prc,
                e = x.prc,
                f = x.prc,
                k = x.prc)
head(a)
            x           y           d           e           f           k
1 -0.45145433 -0.45145433 -0.45145433 -0.45145433 -0.45145433 -0.45145433
2 -0.55851370 -0.55851370 -0.55851370 -0.55851370 -0.55851370 -0.55851370
3  0.18209145  0.18209145  0.18209145  0.18209145  0.18209145  0.18209145
4 -0.56092768 -0.56092768 -0.56092768 -0.56092768 -0.56092768 -0.56092768
5  0.25689622  0.25689622  0.25689622  0.25689622  0.25689622  0.25689622
6 -0.04558792 -0.04558792 -0.04558792 -0.04558792 -0.04558792 -0.04558792

#### sessionInfo
sessionInfo()
R version 2.15.3 (2013-03-01)
Platform: x86_64-suse-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
 [7] LC_PAPER=C                 LC_NAME=C
 [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] Rcpp_0.10.3      data.table_1.8.8

loaded via a namespace (and not attached):
[1] compiler_2.15.3 tools_2.15.3
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