Initializing help system before first use

problem.setlogfile

problem.setlogfile


Purpose
This directs all Optimizer output to a log file.
Synopsis
problem.setlogfile(filename)
Argument
filename 
The name of the file to which all output will be directed. If set to None, redirection of the output will stop and all screen output will be turned back on (except for DLL users where screen output is always turned off).
Example
The following directs output to the file logfile.log:
p = xpress.problem()
p.setlogfile("logfile.log")
Further information
1. It is recommended that a log file be set up for each problem being worked on, since it provides a means for obtaining any errors or warnings output by the Optimizer during the solution process.
2. If output is redirected with setlogfile all screen output will be turned off.
3. Alternatively, an output callback can be defined using problem.addcbmessage, which will be called every time a line of text is output. Defining a user output callback will turn all screen output off. To discard all output messages the OUTPUTLOG integer control can be set to 0.
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