[R] Build a package - check error

[Eduardo M. A. M.Mendes]

Hi there

Many thanks.

Just to be clear I did read the manual (section 5 and all) and  have even
looked at the package expm which has a src dir with codes in fortran and C
to understand what it is going on.  

I have also read the help for .First.lib.  

Cheers

Ed


-----Original Message-----
From: Uwe Ligges [mailto:ligges at statistik.tu-dortmund.de] 
Sent: Saturday, August 20, 2011 10:38 AM
To: Eduardo Mendes
Cc: r-help at r-project.org
Subject: Re: [R] Build a package - check error



On 20.08.2011 00:41, Eduardo Mendes wrote:
> Hi
>
> I have modified the path to
>
> dyn.load(paste(Sys.getenv("R_LIBS_USER"),"/fortran/src/fortran.so",sep
> =""))


Hmmm, looks like you never took a look into the relevant manual "Writing R
Extensions" nor in the help files I cited below.

?.First.lib has an example:

## Suppose a package needs to call a DLL named 'fooEXT', ## where 'EXT' is
the system-specific extension.  Then you should use .First.lib <-
function(lib, pkg)
   library.dynam("foo", pkg, lib)


You cannot know that the package is in Sys.getenv("R_LIBS_USER")

Note also that the .so file won't be in the path ..../src/... but in
.../lib/... once you install the package in the recommended way using R CMD
INSTALL.

Really, please do read manual!!!




>
> and the package could installed, loaded and the lines with dyn.load
worked.
> It does not look like a pretty solution but works on my linux (I am 
> not sure if it works on my mac or windows).
>
> I am not sure if this is what you meant but as I have no clue what 
> .First.lib does or NAMESPACES means this is the best I come up with.

So again time to read the manual and the help pages.

Best,
Uwe Ligges



> Please correct me if I am wrong.
>
> Many thanks
>
> Ed
>
>
>
> On Fri, Aug 19, 2011 at 6:03 PM, Uwe 
> Ligges<ligges at statistik.tu-dortmund.de
>> wrote:
>
>>
>>
>> On 19.08.2011 22:53, Eduardo Mendes wrote:
>>
>>> Dear R-users
>>>
>>> I am slowly migrating my mex files (MATLAB - Fortran and C) to R.  
>>> To get my own functions available on R section I have decided to 
>>> learn how to build
>>>   a
>>> R package. I choose a simple example with a few Fortran and R 
>>> functions (wrapper).
>>>
>>> The fortran sources are located at src and the R functions at R (as 
>>> recommended).  The building process went ok but R CMD check did not. 
>>> The error mgs was
>>>
>>> Error in dyn.load("fortran.so") :
>>>    unable to load shared object
>>> '/home/eduardo/R_packages/**test.Rcheck/fortran.so':
>>>
>>> Although I can see that R cannot find the compiled fortran code I do not
>>> know what to do.   I believe it is something to do with the following
>>> lines
>>> in  the R-wrapper file
>>>
>>> if (!is.loaded('calnpr'))
>>>                     dyn.load("fortran.so")
>>>
>>
>>
>> 1. If the package is called calnpr, the shared library is also called 
>> that way.
>> 2. you have to provide the path to the shared library.
>>
>> See ?.First.lib for how to do it in a package without NAMESPACE (and 
>> note that NAMESPACES are forced for the next R release).
>>
>> Best,
>> Uwe Ligges
>>
>>
>>   How to add the path so that once the package is installed the 
>> compiled
>>> fortran code can be found?
>>>
>>> Many thanks
>>>
>>> Cheers
>>>
>>> Ed
>>>
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>>
>
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