Re: [Rd] [SoC09-Info] An IPopt interface for R

From: Thomas Lumley <>
Date: Sun, 22 Feb 2009 23:49:23 -0800 (PST)

On Sun, 22 Feb 2009, Douglas Bates wrote:

> On Sun, Feb 22, 2009 at 3:05 PM, Douglas Bates <> wrote:

>> There have been several messages on R-devel mentioning the interior
>> point optimization software Ipopt, https://projects.coin-op/Ipopt/.
>> This C++ library is released under a license called the Common Public
>> License.
>> I have two questions that readers of R-devel may be able to answer.
>> 1) Would creating an Ipopt interface for R be duplicating existing
>> efforts? That is, has someone already done so or is already working
>> on this project.
>> 2) Could a package incorporating Ipopt be released under some version
>> of the GPL or LGPL?

Also, according to the FSF, the CPL used in Ipopt is technically incompatible with the GPL because of its choice of law clause.


Thomas Lumley			Assoc. Professor, Biostatistics	University of Washington, Seattle

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