[Coin-discuss] CoinLpIO

[John J Forrest]

Can't see any harm if it is an option.  Put in so defaults to current 
usage but if changeOnRanges is true then appends _low.



Jean-Sebastien Roy <js at jeannot.org> 
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10/10/2005 06:52 PM
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[Coin-discuss] CoinLpIO






Hi !

I noticed some solvers (like GLPK) complain when two constraints in an
LP file share the same name, as it is the case for files output by
CoinLpIO.cpp's writeLp function when constraints are ranged.

As a quick fix I added "low" to the second constraint. The CPLEX LP 
format definition do not discuss the possibility of multiple constraints 
with the same name (even if it makes sense in this case). Maybe it can 
be made an option ?

diff -r1.5 CoinLpIO.cpp
628c628
<          fprintf(fp, "%s:", rowNames[i]);
---
>          fprintf(fp, "%slow:", rowNames[i]);

Regards,

js
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