OpenSolver 1.7 (11 November 2011)

OpenSolver 1.7 has been released. (OpenSolver 1.6 was an internal release only.) Changes include:

Version 1.7 beta
Added controls in the About box to allow easy installation and uninstallation
Added code to interact nicely with the forthcoming OpenSolver Studio
Improved OpenSolver for use from VBA:
– Build and Solve operations now throw errors (instead of popping up dialogs), allowing dialog-free usage from VBA
– Return codes are better handled (and Solver compatible)
– A new optional parameter has been added to RunOpenSolver to avoid dialogs even if infeasible/unbounded solutions are generated

Version 1.6 beta
Fixed display and editting of an objective target value in the Model dialog.
Modified the Open Last Model in CBC functionality so that it passes any Solver options and any CBC solve parameters to CBC if they are available in any current worksheet
Fixed a minor issue in Model dialog where a RHS could be entered for a new constraint if the user had previously had a Bin or Int constraint selected
Fixed a redim bug in the quick non-linearity checker for models with no constraints (which can happen if there is only a target objective value)
Added “Show optimisation progress while solving”  (being Solver’s “Show Iteration Results”) to the OpenSolver options dialog
Improved operation of Options dialog, including proper sycnronisation of values when opened from the Model dialog
Better handling of the Excel 2010 “Simplex engine” option as used in parallel with “Assume linear model”
Fixed an error in the full non-linearity checker
Added output of dual prices onto the sheet; this is set using the Model dialog
Rearranged Model dialog to better fit new Duals option, and better use space around constraint listing
Better handling of the Excel solver options – OpenSolver now sets all these to sensible defaults
Better handling of users entering formulae in the Model dialog for a constraint RHS in terms of non-English localisation issues, but this still needs work
Fixed a size limitation in Quick Solve, and converted Quick Solve to sparse matrix handling for better memory usage.

One thought on “OpenSolver 1.7 (11 November 2011)”

  1. please can you help me ?? I have an assignment everybody in my class is getting full marks but I can’t solve this can you solve it for me in Excel spreadsheet pleaseeee?? queston is posted below:
    The sale owner of WCR needs to expand output as a result of increasing demand from motor accessory shop. Current output capacity has been reached at 5000 units per year. Each rack is sold to the retailers for $140. Production costs are Direct labor= $10
    Direct material= $12 Fixed cost= $54000.
    The owner is considering two options for expansion.
    Option: 1
    Extend the existing premises but keep the same method of production. This would increase fixed cost by $27000 per year, but direct costs would remain unchanged capacity would be doubled.
    Option: 2
    Purchase new machinery, which will speed up the production process and cut down on the wasted materials. Fixed cost would rise by $6000 per year, but direct costs would be reduced by $2 per unit. Output capacity would increase by 50%.
    Drawing the two break even charts for these options would assess the owner in making his decision, but other issues may have to be considered as well.
    a) Construct break even chart for these two options. Identify breakeven point for each.
    b) What is the maximum profit obtainable in each case?
    c) If the demand next year is expected to be $7000 units, what would be the margin of safety for both the cases?

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