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Using Optimizer Console for running matrices within Mosel

Description
Is it possible to run matrices from Workbench / Mosel?

Not directly, but you can use the Optimizer command of the module mmxprs to work with the Optimizer Console from within Mosel. In this case there is no problem representation in Mosel, but solver controls and attributes (setparam and getparam routines on "XPRS_" parameters) and simple (logging) callbacks can be used. If needed, a Mosel program can parse solver output files (see Appendix 'Log and file formats' of the Optimizer Reference Manual) to retrieve information into Mosel.
  • Loading and running a matrix file in LP or MPS format, reading solver CSV output files into Mosel (runmat.mos)
  • Callback definition when running a matrix file (runmatcb.mos)
  • Setting solver parameters via the console command (runmatparam.mos)

runmatcmd.zip[download all files]

Source Files
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runmat.mos[download]
runmatcb.mos[download]
runmatparam.mos[download]

Data Files
folio10.mps[download]
folio10.lp[download]
optparams.txt[download]




runmat.mos

(!******************************************************
   Mosel Example Problems
   ======================

   file runmat.mos
   ```````````````
   Use Optimizer 'command' to read+solve a matrix file
   -- Read solution output into Mosel structures --
   
  (c) 2017-2022 Fair Isaac Corporation
      author: S.Heipcke, 11 Sep 2017, rev. Oct. 2022
*******************************************************!)
model "running Optimizer command line"
 uses "mmsystem", "mmxprs"

! Load+run on MPS format matrix
 scriptmps:=`
readprob folio10
chgobjsense max
mipoptimize
writesol optsol.asc
`

! Load+run on LP format matrix
 scriptlp:=`
readprob -l folio10
chgobjsense max
mipoptimize
writesol optsol.asc
`

! Uncomment to show the solver log
 setparam("XPRS_verbose", true)

! Uncomment one of the following 2 lines
! command(scriptmps)
 command(scriptlp)

 if getparam("XPRS_SOLSTATUS")=XPRS_SOLSTATUS_OPTIMAL then
   writeln_("Optimal solution: ", getparam("XPRS_MIPOBJVAL"))
 else
   writeln_("No solution found")
   exit(0)
 end-if

! Load the solution output into Mosel
 declarations
  Fields=1..3
  SolVals: array(R:range,Fields) of any
 end-declarations

! Selecting the fields index, name, type, activity value from the solver output
 initializations from "mmsheet.csv:optsol.asc"
   SolVals as "partndx;[](#1,#2,#3,#5)"
 end-initializations

! Display all non-zero valued variables
 forall(i in R | SolVals(i,2)="C" and SolVals(i,3)<>0)
   writeln(SolVals(i,1), "=", SolVals(i,3))

end-model
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