<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1476215079669_17193">Dear all, </div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr">I wrote a model using ZIMPL. I have 32 variables (17 continuous Y[I] and 15 binary X[I])</div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr"><br></div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr">When I generate the .mps file, I have a message saying I have 32 variables but when reading the file using scip I get only 17 variables.</div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr"><br></div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr">This is produced because I have only products when using the variables ( Y[i in I] * X[i in I]) which can be à priori simplified to keep only Y[i in I].</div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr">But I need to consider both variables because in practice Y[i in I] > 0. If my information is correct , ZIMPL imposes the use of greater or equal in the constraints (no strictly greater). In the same time I cannot use Y[i in I] >= epsilon with epsilon near zero.</div><div dir="ltr" id="yui_3_16_0_1_1476215079669_64260">I get the all zeros as a solution which is a ''mathematical'' optimal solution but not an admissible solution. I don't know how to avoid this situation.</div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr"><br></div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr"><br></div><div id="yui_3_16_0_1_1476215079669_17193" dir="ltr">Thank you for your help.</div><div></div><div id="yui_3_16_0_1_1476215079669_17195"> </div><div class="signature" id="yui_3_16_0_1_1476215079669_17197">Monia Hamdi<div id="yui_3_16_0_1_1476215079669_17246"><br></div></div></div></body></html>