mip04.gms : Exercise new XPRESS return code for unbounded MIP
In the model we make sure the XPRESS link is properly handling the
XPRS_MIP_UNBOUNDED code - new in XPVERSION 22.
Contributor: Steve Dirkse, May 2011
Small Model of Type: MIP
<![CDATA[
$title Exercise new XPRESS return code for unbounded MIP (MIP04,SEQ=525)
$ontext
In the model we make sure the XPRESS link is properly handling the
XPRS_MIP_UNBOUNDED code - new in XPVERSION 22.
Contributor: Steve Dirkse, May 2011
$offtext
variable x, y, z;
equations f, g;
f.. z =e= x + 2*y;
g.. x - 2*y =L= 2;
model m / f, g /;
solve m using mip max z;
abort$[m.solvestat <> %solvestat.NormalCompletion%] 'Unexpected solvestat', m.solvestat;
abort$[(m.modelstat <> %modelstat.Unbounded%) and (m.modelstat <> %modelstat.Unbounded - No Solution%)] 'Unexpected modelstat', m.modelstat;
]]></plaintext></body></div>