[EMAIL PROTECTED] wrote:
Hello,
I can't link a c code with Mathlib according to introduction of R manual “Writing R Extensions”, page 60.
It is written :
“It is possible to build Mathlib, the R set of mathematical functions documented in
‘Rmath.h’, as a standalone library ‘libRmath’ under Unix and Windows. (This includes
the functions documented in Section 5.7 [Numerical analysis subroutines], page 61 as fromthat header file.)
The library is not built automatically when R is installed, but can be built in the
directory ‘src/nmath/standalone’ in the R sources: see the file ‘README’ there. To use thecode in your own C program include
#define MATHLIB_STANDALONE #include <Rmath.h>
and link against ‘-lRmath’. There is an example file ‘test.c’.”
Have I to do: gcc -lRmath test.c ? In this case I receive this message:
/usr/bin/ld: cannot find -lRmath collect2: ld returned 1 exit status "
what should I do? or I do something before I use "gcc -lRmath test.c" to compile c code test.c?
I will appreciate if you can help me resolve this problem.
yours,
Maggie Wang
Hi Maggie,
(I'm not sure what OS you are using. You never specified. The following works in Windows.)
You should use
gcc test.c -o test.exe -L/path/to/Rmath -lRmath
e.g. if Rmath.dll is in C:/R/R-1.9.0/src/nmath/standalone
gcc test.c -o test.exe -LC:/R/R-1.9.0/src/nmath/standalone -lRmath
Then make sure test Rmath.dll is in your path so that test.exe knows where the dll is.
--sundar
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