ampl / mp

An open-source library for mathematical programming
https://mp.ampl.com
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Latest Xpress is missing a version number, etc. #197

Closed 4er4er4er closed 1 year ago

4er4er4er commented 1 year ago

The latest version of Xpress is missing a key version number in the solve message. Compare the solve message from MP,

ampl: model multmip3.mod;
ampl: data multmip3.dat;
ampl: option solver xpress;

ampl: solve;
xpress-mp 41.01.01: ?179 Warning: Load MIP solution faxpress-mp 41.01.01: optimal solution; objective 235625
1036 simplex iterations
3 branching nodes
absmipgap=0.224765, relmipgap=9.5391e-07

to the solve message from ASL:

ampl: model multmip3.mod;
ampl: data multmip3.dat;
ampl: option solver xpress;

ampl: solve;
XPRESS 9.0.0(41.01.01): Global search complete
Best integer solution found 235625
3 branch and bound nodes
No basis.

For some reason, Xpress has always had two version numbers, but when FICO announces a new version, they use the smaller one -- previously 8.11.2 and now 9.0.0. Thus it is desirable to keep the smaller one in the solve message.

Two other glitches: