Re: [Rd] (no subject)

From: Martin Maechler <>
Date: Tue, 19 Jul 2011 11:35:52 +0200

>>>>> Simon Urbanek <> >>>>> on Tue, 28 Jun 2011 11:31:58 -0400 writes:

    > On Jun 28, 2011, at 9:58 AM, Michelle.Carey wrote:

>> Hi,
>> I am trying to write code in C for an R package. I need
>> high precision in the form of the mpfr and gmp packages.

    > gmp is available as R package
    > do
    > you really need it at a lower level than that?

and so is MPFR: Package 'Rmpfr'

(both on CRAN and R-forge)

.. and I am asking the same question as Simon: Are you sure you need to use your own C code, instead of simply using the R packages 'gmp' and 'Rmpfr' and work with R code?

Martin Maechler, ETH Zurich

>> I have installed mpfr and gmp under the instructions of
>> the following website
>> and I get no errors. I have put the header files (mpfr.h
>> and gmp.h) in the folder C:\Program
>> Files\R\R-2.13.0\include;
> That doesn't sound right - the instructions you quote > install in the default location which is presumably > /usr/local so you should simply set your flags to use that > location.
>> allowing my c code to identify the header files by
>> incorporating include<gmp.h> and include<mpfr.h>.
>> Unfortunately when I try to include any of the functions
>> listed in the header file I get compile error stating
>> that these functions are undeclared,
> That doesn't sound plausible, either - undeclared function > don't cause errors (not in C). Undefined functions do and > you have to make sure you link the libraries installed > above.
>> even though the source code is in the same directory as
>> my c code that I am trying to compile.
> That bears no meaning - as you said you installed the > libraries, so you have to use those. Source code of > gmp/mpfr has no effect on your code and should not be > anywhere near it. > Cheers, Simon
>> Any help on this matter would be greatly appreciated.
>> Kind Regards,
>> Michelle Carey
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