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<body class='hmmessage'><div style="text-align: left;">Hi,<br><br>I understand that the "branchAndBound" method as part of OsiClpSolverInterface is not for 'heavy' use, however:<br>Is it correct that OsiClp will only solve problems where the integer variables have reasonable upper (and lower, I guess) bounds?<br><br>For example, I've tried a simple problem like max x1 + x2, st. x1 + 2 * x2 <= 3.9 with x1, x2 >= 0 and integer.<br><br>NAME BLANK <br>ROWS<br> N OBJROW<br> L R0000000<br>COLUMNS<br> C0000000 OBJROW 1. R0000000 1. <br> C0000001 OBJROW 1. R0000000 2. <br>RHS<br> RHS R0000000 3.9 <br>BOUNDS<br> UI BOUND C0000000 1e+30<br> UI BOUND C0000001 1e+30<br>ENDATA<br><br>This wont solve correctly <br><br>Coin0506I Presolve 0 (-1) rows, 0 (-2) columns and 0 (-2) elements<br>Clp0000I Optimal - objective value 3.9<br>Coin0511I After Postsolve, objective 3.9, infeasibilities - dual 0 (0), primal 0 (0)<br>Clp0032I Optimal objective 3.9 - 0 iterations time 0.002, Presolve 0.00<br>Clp0006I 0 Obj 3.9 Primal inf 3.9 (1)<br>Clp0006I 1 Obj -0<br>Clp0001I Primal infeasible - objective value -0<br>(and stops here)<br><br>unless I add something like x1, x2 <= 10<br><br>Is this an (undocument?) requirement, or am I doing something wrong..<br><br>Thanks,<br><br>Jan-Willem Goossens<br><br><br></div><br /><hr />Je foto's bewerken en in elkaar laten overlopen <a href='http://get.live.com/nl-nl/wl/all' target='_new'>met Windows Live Fotogalerij</a></body>
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