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2010 Jun 16
1
R and LINGO?
...s anyone in the R-help list have experience writing an R wrapper that interfaces with the commercial packages LINGO and/or LINDO.api from R?
I have a set of nonlinear/mixed integer problems that solve nicely with LINGO but I would like to use R to set the problems up and analyze/plot the solutions dynamaically. I have searched the archives and have not found any R packages that enable me to obtain solutions to mixed integer problems with linear and quadratic constraints.
If I have missed one, we would be happy to hear which package we could consider as an alternative to LINGO.
Any help or suggesti...
2010 Aug 02
0
(no subject)
...t;97258031 at nccu.edu.tw>
To: "r-help" <r-help at r-project.org>
Subject: [R] problems about dynamic GMM
Message-ID: <1280508297.13984.97258031 at nccu.edu.tw>
Content-Type: text/plain; charset=big5
Dear all,
I am a new user of R, and I would like to use R to estimate dynamaic GMM
of Arellano and Bond (1991).
The package I used is "plm" and its code "pgmm."
However, the regression cannot run and it showed an error message:
"Error in solve.default(Reduce("+", A2)) :
system is computationally singular: reciprocal condition number =...