Hi Vineetha
It seems that there are some problems in the Fortran code as far as allocating
memory is concerned. If you have statements such as double preciosion :: y(n)
you will need to allocate memory for the vector within the Fortran code or in
the R wrapper-function. It is hard to pinpoint the error without seeing the
source files.
Cheers
Ed
> On Jun 16, 2016, at 2:03 PM, Kodalore Vijayan, Vineetha W <vwk...@mun.ca>
> wrote:
>
> Hi Eduardo,
>
> Thanks for your comments. I haven't tried the way you told me. Now when I
> tried, got the following error:
>
> *** caught segfault ***
> address 0x0, cause 'memory not mapped'
>
> Traceback:
> 1: .Fortran("dataxy", n = as.integer(n), tmax = as.integer(tmax), alpha
> = as.double(alpha), beta = as.double(beta), x = as.double(0, length =
> n), y = as.double(0, length = n), tau = as.integer(0, length = n))
> 2: out(NULL, NULL, NULL, NULL)
>
> Possible actions:
> 1: abort (with core dump, if enabled)
> 2: normal R exit
> 3: exit R without saving workspace
> 4: exit R saving workspace
> Selection:
>
> Any suggestions?
>
> Thanks,
> Vineetha
>
> On Wed, Jun 15, 2016 at 3:55 PM, Eduardo M. A. M.Mendes <emammen...@gmail.com
> <mailto:emammen...@gmail.com>> wrote:
> Hi
>
> Have you tried to load and run the fortran code using just a wrapper function
> in R? I do that as the first step in order to build a package.
>
> Example: fortran sources -> rk4_mod_r.f90 ,derive_henonheilles.f90,
> poincare_section.f90
>
> a) I use R CMD SHLIB rk4_mod_r.f90 ,derive_henonheilles.f90,
> poincare_section.f90 - o poincare_section_henonheilles_rk4.so
> b) Then I write a wrapper function in R, poinc_section_henonheilles.R
> ...
> dyn.load("poincare_section_henonheilles_rk4.so")
>
> out<-.Fortran("section_crossing",
> h=as.numeric(h),
> nphas=as.integer(nphas),..
> ...
> c) and call the function as usual.
>
> Please note that the function called by .Fortran is the name of the
> subroutine within poincare_section.f90 and not the filename.
>
> I take the opportunity to thank R-developers for making the calling of C and
> Fortran in R very easy.
>
> I hope this helps.
>
> regards
>
> Ed
>
> PS. If you need an example of a package using Fortran90, please check
> https://github.com/emammendes/mittagleffler
> <https://github.com/emammendes/mittagleffler>
>
>
>
>> On Jun 15, 2016, at 5:20 PM, Kodalore Vijayan, Vineetha W <vwk...@mun.ca
>> <mailto:vwk...@mun.ca>> wrote:
>>
>> Hi,
>>
>> I'm trying to write an R package that calls a Fortran subroutine on my Mac
>> os x El Capitan with Xcode 7 and gfortran 6.1, R 3.3.0. I can build and
>> load the library but when I try to use it in R I get this error:
>>> library(NEpidemic)
>>> random_epi(variable_names)
>>
>> Error in .Fortran("random_epi", : "random_pi" not resolved from current
>> namespace (NEpidemic).
>>
>> Then I tried adding useDynLib(random_epi.f95) in the NAMESPACE file,
>> additional to useDynLib(NEpidemic). After doing that I couldn't build the
>> package and it gave me another error:
>>
>> Error in library.dynam(lib, package, package.lib) :
>> shared object ‘random_epi.so’ not found
>> Error: loading failed
>> Execution halted
>> ERROR: loading failed
>>
>> When I checked my src folder, there is only random_epi.o file. How can I
>> fix this issue? Any help would be much appreciated. I'm vey new to both R
>> and Fortran coding, especially in package building.
>>
>> Thanks in advance!
>> Vineetha
>>
>>
>> [[alternative HTML version deleted]]
>>
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>
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