Just a guess (based on evidence of failing to read other instructions
that were made available), but have you perhaps forgotten to install
Rtools for Windows?
http://cran.r-project.org/bin/windows/Rtools/
--
David.
On Feb 19, 2012, at 5:13 PM, zheng wei wrote:
Dear All,
I have difficulty in installing the package of Rcplex. Its
description web is at
http://cran.r-project.org/web/packages/Rcplex/index.html
First, I tried
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url <- "http://cran.r-project.org/src/contrib/Rcplex_0.3-0.tar.gz";;
download.file(url, basename(url), mode="wb")
install.packages(basename(url), repos=NULL)
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but got the error of
--------------------------------------------------------------------------------------------------
install.packages(basename(url), repos=NULL)
Error in gzfile(file, "r") : cannot open the connection
In addition: Warning messages:
1: In unzip(zipname, exdir = dest) : error 1 in extracting from zip
file
2: In gzfile(file, "r") :
cannot open compressed file 'Rcplex_0.3-0.tar.gz/DESCRIPTION',
probable reason 'No such file or directory'
--------------------------------------------------------------------------------------------------
Then, I looked into the installation instruction of this package at
http://cran.r-project.org/web/packages/Rcplex/INSTALL
Since I am using windows, I was looking at the instruction as
--------------------------------------------------------------------------------------------------
***WINDOWS***
Installation on Windows systems is done by using the provided
Makevars.win file in the src directory. It contains the following
lines:
PKG_CPPFLAGS=-I<CPLEX_DIR>/include
PKG_LIBS=-L<CPLEX_DIR>/lib/x86_windows_vs2008/stat_mda -lcplex111 -lm
where <cplex_dir> is the cplex installation directory
e.g. /c/ilog/cplex111. Please edit your Makevars.win file accordingly.
We have successfully tested this procedure with CPLEX 11.1 on 32-bit
Windows XP.
--------------------------------------------------------------------------------------------------
I do not understand what it means exactly. I do fine the file of
Makevars.win, and confirmed the content as described above. But what
directory should I replace "/c/ilog/cplex111", and how to proceed so
as to install the package. I got no idea. One thing to note is that
it is stated from the web http://cran.r-project.org/web/views/Optimization.html
that
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Interfaces to Commercial Optimizers
This section surveys interfaces to commercial solvers. Typically,
the corresponding libraries have to be installed separately.
* PackagescplexAPI andRcplex provide an interface to the CPLEX
solver package from IBM . CPLEX provides dual/primal simplex
optimizers as well as a barrier optimizer for solving large scale
linear and quadratic programs. Furthermore, it offers a mixed
integer optimizer to solve difficult mixed integer programs. Note
that CPLEX is not free and you have to get a license from IBM .
Academics will receive a free licence upon request. [LP, IP, BP,
QP, MILP, MIQP, IPM]
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I am not sure the above statement is relevant or not. In case there
is a necessary to get the license, since I work in a university and
I think I could figure out how to get it by consulting the support
within my own university.
Thank you very much!
William
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
