[Ipopt-tickets] [Ipopt] #91: Ipopt in R under Linux - a bug or complilation error?

[Ipopt]

#91: Ipopt in R under Linux - a bug or complilation error?
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  Reporter:  anton              |       Owner:  andreasw                          
      Type:  defect             |      Status:  assigned                          
  Priority:  normal             |   Component:  Ipopt                             
   Version:  3.5 (C++ Version)  |    Severity:  normal                            
Resolution:                     |    Keywords:  R, interface, Ipopt, Linux, x86-64
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Comment (by anton):

 Hi Andreas,

 Thank you for your feedback. I have found the cause of the crash. It was
 an incorrect name for the output file. (As a newcomer to Linux I missed
 the point that the ‘~’ sign as a substitute for the home directory may not
 work outside the shell.) Ipopt failed to open the file, created a null
 pointer file_jrnl in method IpoptApplication::OpenOutputFile, and then
 crashed when trying to write to array file_jrnl->print_levels_ in method
 Journal::SetPrintLevel.

 I propose to insert a check of the validity of the file_jrnl pointer
 before calling SetPrintLevel – in the same way as it is already done for
 pointer stdout_jrnl in method IpoptApplication::Initialize. Perhaps, it
 would be even more consistent to include such a check for every pointer to
 a Journal object created by Journalist::AddFileJournal method. In this
 case ipopt would not crash but merely generate empty output. This helped
 me to find the error, and it might help others too.

 Also thank you for the hint with creating new journalists – I will try
 this. I had a problem with standard output in R under Windows indeed, and
 solved that by redefining methods FileJournal::PrintImpl, but I would
 prefer a more elegant solution.

 Best regards,
 Anton

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Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/91#comment:2>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.