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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>This may not be the most elegant solution, but you can take equality constraints into account by adding a penalty to your cost function if they are not met (e.g. cost = “real cost” + 1e6*(1000-x*y*z)^2).<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>In this particular case, I would suggest a simpler way which is to let x and y be the parameters that vary (independent variables) and define z as a derived (dependent) variable with z = 1000/(x*y).<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I hope this helps.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Michaël Kummert, Polytechnique Montréal<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> trnsys-users-bounces@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] <b>On Behalf Of </b>Safizadeh Mohammadreza<br><b>Sent:</b> Friday, May 23, 2014 06:48<br><b>To:</b> trnsys-users@cae.wisc.edu<br><b>Cc:</b> Safizadeh Mohammadreza<br><b>Subject:</b> [TRNSYS-users] GenOpt: Identifing equality constraints for independent variables (x*y*z=1000)<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Dear Trnsys users,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>For running my optimization (GenOpt + Trnsys), I need to define two types of following constraints for independent variables to be optimized:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Variables to be optimized are: x, y and z<o:p></o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='color:#1F497D'>Constraints:<o:p></o:p></span></b></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><b><span lang=EN-US style='color:#1F497D'><span style='mso-list:Ignore'>1-<span style='font:7.0pt "Times New Roman"'> </span></span></span></b><![endif]><b><span lang=EN-US style='color:#1F497D'>Boundary constraints: 0<x<20, 0<y<20, 0<z<20<o:p></o:p></span></b></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><b><span lang=EN-US style='color:#1F497D'><span style='mso-list:Ignore'>2-<span style='font:7.0pt "Times New Roman"'> </span></span></span></b><![endif]><b><span lang=EN-US style='color:#1F497D'>Equality constraints: x*y*z=1000<o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>To this end, I could make the boundary constraints in command file <b>but I could not find a solution to define equality constraints</b>.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>I would appreciate if you could let me know how I can define equality constraints within GenOpt or Trnsys.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Best regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Reza Safi<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>_____________________________________________<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Division Thermal Systems and Buildings<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Fraunhofer-Institut für Solare Energiesysteme ISE<o:p></o:p></span></p></div></body></html>