Initializing help system before first use

Running the Model in Xpress Workbench

At this stage, you can run the model via the Mosel command line or from Xpress Workbench. This guide follows a workflow that uses the facilities provided by the browser-based variant of Xpress Workbench and (later) its close integration with Xpress Insight.
Before trying to run anything, ensure that you have prepared two files:
  • foliodata.mos - the model source file as described earlier.
  • folio.dat - the separate data file containing values for the RET, RISK and NA entities, and implicitly the SHARES entity - again as described earlier.
To load and run the model within Xpress Workbench:
  1. Visit the Xpress Workbench URL and log in.
  2. In the Xpress Workbench Home page, click Create Project, enter a value of Portfolio Optimization in the Name field in the subsequent Create Project dialog and then click Save.
    A new tile called Portfolio Optimization appears in the Xpress Workbench Home page.
    Note Depending upon your installation, you may see an existing project tile labeled Portfolio - an Optimization Model Example on the Xpress Workbench Home page. This is a more advanced portfolio optimization model provided as an example, and is unrelated to the new Portfolio Optimization project just created.
  3. Click on the Portfolio Optimization tile.
    Xpress Workbench launches your new project in which it has created a template application structure. Examine the contents of the vertical Project tab:

    A New Optimization Designer Workspace

    A New Xpress Workbench Project

    This arrangement of new files and folders is designed to help you start quickly with a new Xpress Insight app.
  4. However, for this first walk-through, we are going to start from scratch, so right-click on the following resources, choose Delete, and confirm:
    • client_resources - folder
    • model_resources - folder
    • source - folder
    • application.xml - file

    You are left with a single empty Portfolio Optimization root directory.

  5. In the File menu, choose Upload Local Files and follow the prompts to upload your prepared files - foliodata.mos and folio.dat - to the Portfolio Optimization root folder.
    The project structure now appears as:

    Uploaded Model Source and Data Files

    Uploaded Model Source and Data Files

  6. In the Run menu, choose Run foliodata.mos and wait a few moments.
    The model compiles and runs, and a new file appears in the project tab, which now appears as:

    First Run Workspace Contents

    Project Contents After First Model Run

    The new file is result.dat, the output file written by the model, originally declared as a parameter in line 8.
    Note Depending on the settings of your Xpress Workbench environment, some other files may also appear at this stage. For the purposes of this tutorial, they can safely be ignored.
  7. Review the contents of result.dat.
    It contains: 
    Total return: 14.0667
treasury    : 	30.000%
hardware    : 	0.000%
theater     : 	20.000%
telecom     : 	0.000%
brewery     : 	6.667%
highways    : 	30.000%
cars        : 	0.000%
bank        : 	0.000%
software    : 	13.333%
electronics : 	0.000%
    This reveals that the maximum achievable ROI is 14.0667, and that based on the model's constraints, the optimum division of investment capital among share types is 30% to treasury, 20% to theater, 6.667% to brewery, 30% to highways and 13.333% to software.

The model has been run in its native form as a Mosel model, albeit called and executed by Xpress Workbench.

Parent Topic Building an Xpress Insight App