[Coin-discuss] Cbc link to AMPL and Osi link to opbdp

[John J Forrest]

I have put in a beta version of CBC which can be called directly from 
AMPL.  It seems usable but could be extended.  See Cbc/README and 
Makefiles/Makefile.location for hints.  To use it you will have to 
download the AMPL interface source code and build AMPL interface library 
and modify Makefile.locations.  Then when you do "make solve" in Cbc you 
will get an AMPL enabled version of "solve".

Now "solve" is not a good name for an AMPL solver so I would copy it to 
"cbc" in a directory AMPL uses.  It is just as the normal executable but 
it will read problem and write solution from and to ampl files if the 
first argument is xxxxx.nl and the second is -AMPL.  Command line 
arguments are as normal but should be set in cbc_options inside AMPL - the 
syntax is more MINOS like for AMPL parsing so "-cuts root" would be 
entered as "cuts=root" etc. 

I also have been playing with opbdp.  This is an implicit enumeration 
solver for pure 0-1 problems which has been useful in some work I have 
been doing so I have written a simple interface to it OsiOpbdpSolve.?pp - 
an example of use is in OsiSolverInterfaceTest.cpp.  I have a small patch 
to code which allows you to obtain all feasible solutions to a pure 0-1 
problem in case that is of any interest - details of patch in 
OsiOpbdpsolve.hpp.

John Forrest
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