How to compare matrices from PIMS and AUP?

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Products: Aspen PIMS Advanced Optimization, Aspen Unified PIMS 
Last Updated: 30-May-2021
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Article ID: 000098618
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Applicable Version
V12

Problem Statement
Sometimes you could face the issue when PIMS model run results are different from AUP run of migrated model which caused by discrepancies in matrix structure. This workflow will help you to investigate.
Solution
Here’s a brief how-to for comparing matrices from PIMS and AUP:
  1. Run PIMS and AUP and locate the “Xlp_new.xlp” files from each run.
    1. Xlp_new.xlp is the pre-solve matrix. AUP and PIMS use the same solver, so it’s likely that differences in the solved state are caused by differences in the pre-solved state.
    2. You could copy-paste these files somewhere and rename them “Xlp_new_AUP.xlp” and “Xlp_new_PIMS.xlp” so you don’t mix them up.
 
  1. Open the Matrix Comparison program (MatComp.exe, located in PlanningAnalysisTools) and load up the two files.
 
  1. Matrix Comparison will tell you if a variable or equation is missing, among other things.
    1. Differences between AUP and PIMS often come down to missing or added matrix structure.
    2. It may also be useful to have the two matrix files open in the Matrix Analysis Program
 
  1. The name of the variable or equation that is missing or added should give some direction as to what part of the model is misbehaving.

Keywords
migration
matrix
comparison
xlp