Dirk Eddelbuettel a écrit :
Well, Debian comes to the rescue. Do 'sudo apt-get install r-mathlib' to the
standalone library. Then copy the example file out, add the missing 'extern
N01type N01_kind;' (and that it is missing may well be a bug -- I used 2.10.1
here -- anyone from R Core listening in who can add the one line ?)
e...@ron:~> cp /usr/share/doc/r-mathlib/examples/test.c /tmp/
e...@ron:~> grep extern /tmp/test.c
extern N01type N01_kind; /* from nmath/snorm.c */
e...@ron:~> gcc -o /tmp/mathlibtest /tmp/test.c -lRmath -lm
e...@ron:~> /tmp/mathlibtest
*** loaded '/tmp/mathlibtest'
one normal 1.119638
normal via BM -1.734578
e...@ron:~>
OK. Thanks. Hadn't noticed the documentation of r-mathlib. Should have
known better.
However, I still do not understand what the -lm is useful for.
I hope this answers your questions -- the standalone math library links with
only its libRmath and nothing else from R. It also only consume Rmath.h
(which I put into /usr/include so you need no -I arguments to gcc).
Yes, that answers my question.
Hope this helps, Dirk
PS For reference, here is test.c with line edited in:
/*
* Mathlib : A C Library of Special Functions
* Copyright (C) 2000-7 The R Development Core Team
*
* This program 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.
*
* This program 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 this program; if not, a copy is available at
* http://www.r-project.org/Licenses/
*
*/
#define MATHLIB_STANDALONE 1
#include <Rmath.h>
#include <stdio.h>
typedef enum {
BUGGY_KINDERMAN_RAMAGE,
AHRENS_DIETER,
BOX_MULLER,
USER_NORM,
INVERSION,
KINDERMAN_RAMAGE
} N01type;
extern N01type N01_kind; /* from nmath/snorm.c */
int
main(int argc, char** argv)
{
/* something to force the library to be included */
qnorm(0.7, 0.0, 1.0, 0, 0);
printf("*** loaded '%s'\n", argv[0]);
set_seed(123, 456);
N01_kind = AHRENS_DIETER;
printf("one normal %f\n", norm_rand());
set_seed(123, 456);
N01_kind = BOX_MULLER;
printf("normal via BM %f\n", norm_rand());
return 0;
}
--
Guillaume Yziquel
http://yziquel.homelinux.org/
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