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#!/usr/bin/r -t
#
# Copyright (C) 2009 - 2010 Dirk Eddelbuettel and Romain Francois
#
# This file is part of Rcpp.
#
# Rcpp is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# Rcpp is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
suppressMessages(library(Rcpp))
suppressMessages(library(inline))
firstExample <- function() {
## a really simple C program calling three functions from the GSL
gslrng <- '
gsl_rng *r;
gsl_rng_env_setup();
double v;
r = gsl_rng_alloc (gsl_rng_default);
printf("generator type: %s\\n", gsl_rng_name (r));
printf("seed = %lu\\n", gsl_rng_default_seed);
v = gsl_rng_get (r);
printf("first value = %.0f\\n", v);
gsl_rng_free(r);
return R_NilValue;
'
## turn into a function that R can call
## compileargs redundant on Debian/Ubuntu as gsl headers are found anyway
funx <- cfunction(signature(), gslrng,
includes="#include <gsl/gsl_rng.h>",
Rcpp=FALSE,
cppargs="-I/usr/include",
libargs="-lgsl -lgslcblas")
cat("Calling first example\n")
funx()
invisible(NULL)
}
secondExample <- function() {
## now use Rcpp to pass down a parameter for the seed
gslrng <- '
int seed = Rcpp::as<int>(par) ;
gsl_rng *r;
gsl_rng_env_setup();
double v;
r = gsl_rng_alloc (gsl_rng_default);
gsl_rng_set (r, (unsigned long) seed);
v = gsl_rng_get (r);
#ifndef BeSilent
printf("generator type: %s\\n", gsl_rng_name (r));
printf("seed = %d\\n", seed);
printf("first value = %.0f\\n", v);
#endif
gsl_rng_free(r);
return Rcpp::wrap(v) ;
'
## turn into a function that R can call
## compileargs redundant on Debian/Ubuntu as gsl headers are found anyway
## use additional define for compile to suppress output
funx <- cfunction(signature(par="numeric"), gslrng,
includes="#include <gsl/gsl_rng.h>",
Rcpp=TRUE,
cppargs="-I/usr/include",
libargs="-lgsl -lgslcblas")
cat("\n\nCalling second example without -DBeSilent set\n")
print(funx(0))
funx <- cfunction(signature(par="numeric"), gslrng,
includes="#include <gsl/gsl_rng.h>",
Rcpp=TRUE,
cppargs="-I/usr/include -DBeSilent",
libargs="-lgsl -lgslcblas")
cat("\n\nCalling second example with -DBeSilent set\n")
print(funx(0))
invisible(NULL)
}
thirdExample <- function() {
## now use Rcpp to pass down a parameter for the seed, and a vector size
gslrng <- '
int seed = Rcpp::as<int>(s) ;
int len = Rcpp::as<int>(n);
gsl_rng *r;
gsl_rng_env_setup();
std::vector<double> v(len);
r = gsl_rng_alloc (gsl_rng_default);
gsl_rng_set (r, (unsigned long) seed);
for (int i=0; i<len; i++) {
v[i] = gsl_rng_get (r);
}
gsl_rng_free(r);
return Rcpp::wrap(v) ;
'
## turn into a function that R can call
## compileargs redundant on Debian/Ubuntu as gsl headers are found anyway
## use additional define for compile to suppress output
funx <- cfunction(signature(s="numeric", n="numeric"),
gslrng,
includes="#include <gsl/gsl_rng.h>",
Rcpp=TRUE,
cppargs="-I/usr/include",
libargs="-lgsl -lgslcblas")
cat("\n\nCalling third example with seed and length\n")
print(funx(0, 5))
invisible(NULL)
}
fourthExample <- function() {
## now use Rcpp to pass down a parameter for the seed, and a vector size
gslrng <- '
int seed = Rcpp::as<int>(s);
int len = Rcpp::as<int>(n);
gsl_rng *r;
gsl_rng_env_setup();
std::vector<double> v(len);
r = gsl_rng_alloc (gsl_rng_default);
gsl_rng_set (r, (unsigned long) seed);
for (int i=0; i<len; i++) {
v[i] = gsl_rng_get (r);
}
gsl_rng_free(r);
return wrap(v);
'
## turn into a function that R can call
## compileargs redundant on Debian/Ubuntu as gsl headers are found anyway
## use additional define for compile to suppress output
funx <- cfunction(signature(s="numeric", n="numeric"),
gslrng,
includes=c("#include <gsl/gsl_rng.h>",
"using namespace Rcpp;",
"using namespace std;"),
Rcpp=TRUE,
cppargs="-I/usr/include",
libargs="-lgsl -lgslcblas")
cat("\n\nCalling fourth example with seed, length and namespaces\n")
print(funx(0, 5))
invisible(NULL)
}
firstExample()
secondExample()
thirdExample()
fourthExample()
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