Problem with GAMS Transfer R

GAMS
1

Hello GAMS Forum
I tried to use GAMS Tranfer R.
I succeeded in installing the gamstransfer library but when I run the line: m = Container$new() I have an error message: “Error in find_gams() :
Could not find a GAMS installation, must manually specify system directory”
I understand that the system directory is not well specified in the find_gams function, but I don’t know how to specify it manually.
can someone help me?
Thank you
Sophie

2

Sophie,
There are a couple ways to get gams transfer R to identify the system directory.

  1. Add gams system directory to your system variable PATH. Depending on the platform you use, there are different ways to achieve this. This is the recommended and easier solution.

  2. Alternatively, you can use systemDirectory argument to the container constructor.
    m=Container$new(systemDirectory=“C:/GAMS/44”)

You can view this in the documentation:

https://www.gams.com/44/docs/API_R_GAMSTRANSFER.html#R_GAMSTRANSFER_CREATE_CONTAINER

Hope this helps.

Best, Atharv

3

Thank you so much
Regards
Sophie

4

I’m trying to use GAMS Transfer and R since the gdxrrw package is no longer functioning. I’ve been following the instructions, but when I import the package, I encounter a warning that says, ‘inferring ‘repos = NULL’ from ‘pkgs’.’ Furthermore, when attempting to import the library using library(gamstransfer), I receive the following error: ‘Error: package or namespace load failed for ‘gamstransfer’ in loadNamespace(j ← i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]): there is no package called ‘collections’.’ Could someone please advise me on what might be causing this issue with the gamstransfer package import?

5

Lorena,

Looks like you haven’t installed gams transfer dependencies.
Since gams transfer is not on cran or similar online repo, installation does not automatically find these dependencies. You have to manually install them.

To install all dependencies at once, you can just do
install.packages(c(“R6”, “Rcpp”, “collections”, “R.Utils”))
You can also do them individually
install.packages(“R6”) and so on

Hope this helps. This will resolve the error.

Best, Atharv

6

Thank you for your reply. Unfortunately it doesn’t work. This is my code.

install.packages(“R6”)
install.packages(“Rcpp”)
install.packages(“R.utils”)
install.packages(“collections”)

install.packages(“gamstransfer”)

install.packages(“/Library/Frameworks/GAMS.framework/Versions/42/Resources/apifiles/R/gamstransfer/binary/gamstransfer.tgz”, type=“binary”)#library(gamstransfer)

setwd(“/Users/lorenareyes/Desktop/LR/noPattern_Lagrangian/”)

m = Container$new(“4.3_output_zn_49_bn_64_nc_0.5_2055_lagrangian_noPattern.gdx”, systemDirectory=“/Library/Frameworks/GAMS.framework/Versions/42/Resources/”)[/b][/b]


When I use the install.packages(“gamstransfer”) command I get this error:
package ‘gamstransfer’ is not available for this version of R

so I am using this command:
install.packages(“/Library/Frameworks/GAMS.framework/Versions/42/Resources/apifiles/R/gamstransfer/binary/gamstransfer.tgz”, type=“binary”)#library(gamstransfer)
There I get the following warning:
inferring ‘repos = NULL’ from ‘pkgs’.
when I run the code it seems that the gamstransfer package is not installed because I get the following error:
Error: object ‘Container’ not found
Thanks for any help you can give me

Best,
Lorena

7

Lorena,

Looks like you made progress.

Your second command (with full path) seems right. Are you loading gamstransfer before using Container$new() ? I see that you have commented out library(gamstransfer) command. You will need to load gamstransfer with library(gamstransfer) every time you use it.

If the error persists, please send the output of sessionInfo() command.

Best, Atharv

8

Dear Atharv,
Thank you for your response. Yes, I am using library(gamstransfer) in my code.

Here is my code:

install.packages(“R6”)
install.packages(“Rcpp”)
install.packages(“R.utils”)
install.packages(“collections”)

install.packages(“gamstransfer”)

install.packages(“/Library/Frameworks/GAMS.framework/Versions/42/Resources/apifiles/R/gamstransfer/binary/gamstransfer.tgz”, type=“binary”)
library(gamstransfer)
setwd(“/Users/lorenareyes/Desktop/LR/noPattern_Lagrangian/”)

m = Container$new(“4.3_output_zn_49_bn_64_nc_0.5_2055_lagrangian_noPattern.gdx”, systemDirectory=“/Library/Frameworks/GAMS.framework/Versions/42/Resources/”)


Hera are my errors I’m encountering:
Error: package or namespace load failed for ‘gamstransfer’ in dyn.load(file, DLLpath = DLLpath, …):
unable to load shared object ‘/Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/library/gamstransfer/libs/gamstransfer.so’:
dlopen(/Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/library/gamstransfer/libs/gamstransfer.so, 0x0006): tried: ‘/Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/library/gamstransfer/libs/gamstransfer.so’ (mach-o file, but is an incompatible architecture (have ‘x86_64’, need ‘arm64’)), ‘/System/Volumes/Preboot/Cryptexes/OS/Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/library/gamstransfer/libs/gamstransfer.so’ (no such file), ‘/Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/library/gamstransfer/libs/gamstransfer.so’ (mach-o file, but is an incompatible architecture (have ‘x86_64’, need ‘arm64’))
Error: object ‘Container’ not found

sessionInfo()
R version 4.3.2 (2023-10-31)
Platform: aarch64-apple-darwin20 (64-bit)
Running under: macOS Sonoma 14.2

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/lib/libRlapack.dylib; LAPACK version 3.11.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: Europe/Berlin
tzcode source: internal

attached base packages:
[1] stats graphics grDevices utils datasets methods
[7] base

loaded via a namespace (and not attached):
[1] compiler_4.3.2 R6_2.5.1 tools_4.3.2
[4] collections_0.3.7 rstudioapi_0.15.0 Rcpp_1.0.11
[7] R.methodsS3_1.8.2 R.utils_2.12.3 R.oo_1.25.0

I would greatly appreciate your assistance with this issue.

Best regards,

Lorena

9

Please make sure you are downloading GAMS and R for ARM64 architecture and try installing again.

Best, Atharv