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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Hi,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">I am trying to solve a nonlinear problem using the Jupyter Notebook interface to Python 3.7 via Ipopt through Pyomo modeling method.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Unfortunately, Ipopt could not solve my problem, and I started to look at alternative options.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">I tried to install SCIP following instructions on
<a href="https://www.scipopt.org/index.php#download">here</a>. Then, I tried to use it with Pyomo as follows (shown bold) and received the following error. Can you please help me get going with it?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="color:black">opt = SolverFactory('scip', executable = C:/Program Files/SCIPOptSuite 7.0.2/bin/scip “<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="color:black">results = opt.solve(m, tee=True)<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">invalid parameter <C:\Users\TCOKYA~1\AppData\Local\Temp\tmp25pw_oxr.pyomo.nl><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">invalid parameter <-AMPL><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">syntax: C:\Program Files\SCIPOptSuite 7.0.2\bin\scip.exe [-l <logfile>] [-q] [-s <settings>] [-r <randseed>] [-f <problem>] [-b <batchfile>] [-c "command"]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -v, --version : print version and build options<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -l <logfile> : copy output into log file<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -q : suppress screen messages<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -s <settings> : load parameter settings (.set) file<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -f <problem> : load and solve problem file<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -o <primref> <dualref> : pass primal and dual objective reference values for validation at the end of the solve<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -b <batchfile>: load and execute dialog command batch file (can be used multiple times)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -r <randseed> : nonnegative integer to be used as random seed. Has priority over random seed specified through parameter settings (.set) file<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> -c "command" : execute single line of dialog commands (can be used multiple times)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">---------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">FileNotFoundError Traceback (most recent call last)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><ipython-input-27-5b246395f577> in <module><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 10 opt = SolverFactory('{}'.format(solver_name))<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 11 # print(opt.solve(m))<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">---> 12 results = opt.solve(m, tee=True)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 13 ### END SOLVING THE PROBLEM ###<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">~\Anaconda3\lib\site-packages\pyomo\opt\base\solvers.py in solve(self, *args, **kwds)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 603 print(" %6.2f seconds required for solver" % (solve_completion_time - presolve_completion_time))<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 604 <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">--> 605 result = self._postsolve()<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 606 result._smap_id = self._smap_id<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 607 result._smap = None<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">~\Anaconda3\lib\site-packages\pyomo\solvers\plugins\solvers\SCIPAMPL.py in _postsolve(self)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 168 <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 169 def _postsolve(self):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">--> 170 results = super(SCIPAMPL, self)._postsolve()<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 171 if results.solver.message == "unknown":<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 172 results.solver.status = \<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">~\Anaconda3\lib\site-packages\pyomo\opt\solver\shellcmd.py in _postsolve(self)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 268 <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 269 if self._results_format is not None:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">--> 270 results = self.process_output(self._rc)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 271 #<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 272 # If keepfiles is true, then we pop the<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">~\Anaconda3\lib\site-packages\pyomo\opt\solver\shellcmd.py in process_output(self, rc)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 348 results = self._results_reader(self._results_file,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 349 res=results,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">--> 350 suffixes=self._suffixes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 351 results_reader_completion_time = time.time()<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 352 if self._report_timing is True:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">~\Anaconda3\lib\site-packages\pyomo\opt\plugins\sol.py in __call__(self, filename, res, soln, suffixes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 44 """<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 45 try:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">---> 46 with open(filename,"r") as f:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 47 return self._load(f, res, soln, suffixes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> 48 except ValueError as e:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\TCOKYA~1\\AppData\\Local\\Temp\\tmp25pw_oxr.pyomo.sol'<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Best regards,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-family:"Lucida Calligraphy";color:black">_____________________________________________________________________<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:16.0pt;font-family:"Bradley Hand";color:black">Taner Cokyasar, Ph.D.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-family:"Garamond",serif;color:black">Postdoctoral Appointee Transportation System Modeler<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-family:"Garamond",serif;color:black">Energy Systems Division | Argonne National Laboratory<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-family:"Garamond",serif;color:black"><a href="https://goo.gl/maps/T1VuNPs75J93fn2q9"><span style="color:black">9700 S. Cass Avenue, Lemont, IL 60439</span></a></span><span style="font-family:"Garamond",serif;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="color:black"> </span></b><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-family:"Garamond",serif;color:black">President – Student Leadership Board</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-family:"Garamond",serif;color:black">Logistics and Supply Chain Division | Institute of Industrial & Systems Engineers<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Calligraphy";color:black">_____________________________________________________________________</span><o:p></o:p></p>
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