R help - Mar 2010 - Problem with rcmd SHLIB

Hi all,

I am trying to call a C function from R (version 2.10.1) on a windows machine.

The C code is in a .c file, I have pasted the code below although I'm very
confident that it does not contain any errors (it is not my code), but also, the
problem that I have occurs with every .c file that I have tried this with.

I have installed Rtools and included: 
C:\Rtools\bin; C:\Rtools\perl; C:\Rtools\MinGW\bin;"C:\Program 
Files\R\R-2.10.1\bin"
in my path from My Computer.

I would like to create a .dll file in order to load it in R and call the C
function.

In the command prompt I type:
rcmd SHLIB C:\...\filename.c     (or R CMD SHLIB C:\...\filename.c)
and I get the message:
make: nothing to be done for 'all'

I understand that this message means that the particular file has already been
compiled and no changes have been made and so the .dll file must already exist.
The problem is that this hasn't happened. I have never compiled a .c file
this way on this computer and there definitely aren't any .dll files as
compiling hasn't ever actually worked.

Any ideas about why this is happening?

Thank you all in advance for the help and any feedback,

Best,
Denise

C code:

void convolve1(double *a, int *na,
double *b, int *nb, double *ab)
{
int i, j, nab = *na + *nb -
 1;
for (i = 0; i < nab; i++) ab[i] = 0.0;
for (i = 0; i < *na; i++)
for (j = 0; j < *nb; j++)
ab[i + j] += a[i] + b[j];
}



      
	[[alternative HTML version deleted]]

On 11/03/2010 10:57 AM, denise xifaras wrote:
> Hi all,
>
> I am trying to call a C function from R (version 2.10.1) on a windows
machine.
>
> The C code is in a .c file, I have pasted the code below although I'm
very confident that it does not contain any errors (it is not my code), but
also, the problem that I have occurs with every .c file that I have tried this
with.
>
> I have installed Rtools and included: 
> C:\Rtools\bin; C:\Rtools\perl; C:\Rtools\MinGW\bin;"C:\Program 
> Files\R\R-2.10.1\bin"
> in my path from My Computer.
>   
That is not sufficient:  those need to be first, not just "included".
There are often other versions of make or find or the other tools 
installed on Windows systems.
> I would like to create a .dll file in order to load it in R and call the C
function.
>
> In the command prompt I type:
> rcmd SHLIB C:\...\filename.c     (or R CMD SHLIB C:\...\filename.c)
> and I get the message:
> make: nothing to be done for 'all'
>   
I would recommend switching to that directory, then using Rcmd SHLIB 
filename.c.  Windows pathnames sometimes have spaces in them which can 
mess up the tools.

Duncan Murdoch
> I understand that this message means that the particular file has already
been compiled and no changes have been made and so the .dll file must already
exist. The problem is that this hasn't happened. I have never compiled a .c
file this way on this computer and there definitely aren't any .dll files as
compiling hasn't ever actually worked.
>
> Any ideas about why this is happening?
>
> Thank you all in advance for the help and any feedback,
>
> Best,
> Denise
>
> C code:
>
> void convolve1(double *a, int *na,
> double *b, int *nb, double *ab)
> {
> int i, j, nab = *na + *nb -
>  1;
> for (i = 0; i < nab; i++) ab[i] = 0.0;
> for (i = 0; i < *na; i++)
> for (j = 0; j < *nb; j++)
> ab[i + j] += a[i] + b[j];
> }
>
>
>
>       
> 	[[alternative HTML version deleted]]
>
>   
> ------------------------------------------------------------------------
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

I have never got it working with rcmd SHLIB. it is much easier to create a
shared library separately with the C compiler and then load it with dyn.load

the makefiles for SHLIB are quite big and going through them will give you a
headache, so just use the flag for a dll when you compile.
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