- Excel Solver For Mac Nt Generating Sensitivity Reports
- Excel Solver Not Working On Mac
- Excel Solver For Mac Nt Generating Sensitivity Report Example
- Excel Solver For Mac Nt Generating Sensitivity Report Analysis
The kind of report that Excel will create when Solver is finished: When the Simplex LP or GRG Nonlinear Solving method is used, 1 creates an Answer report, 2 creates a Sensitivity report, and 3 creates a Limit report. When the Evolutionary Solving method is used, 1 creates an Answer report, and 2 creates a Population report. If Solver finds a (locally or globally) optimal solution, and there are no integer constraints, two additional reports are available: the Sensitivity Report and the Limits Report. Reports available when Solver encounters a problem If you receive the message “The linearity conditions required by this LP Solver are not satisfied,” and the.
The Sensitivity Report provides classical sensitivity analysis information for both linear and nonlinear programming problems. It is available for models that do not contain any integer or binary constraints (which we will learn about later in this course). In this module we will focus on the Sensitivity Report for linear models.
An example of a Sensitivity Report generated for a simple Product Mix example is shown below.
Interpreting Reduced Costs and Shadow Prices
- Generating reports with the Solver App is done with the 'Reports' button along the top of the App, between the Reset and Solve buttons. You must first run a Solve to produce the Answer and Sensitivity report. For a Sensitivity report, the following conditions for the model must be met, otherwise you will only receive an Answer Report.
- To derive the Lagrange multiplier, after you click on 'Solve' in Solver, the Solver Results screen shown in Exhibit 10.7 will appear. On this screen, under 'Reports,' select 'Sensitivity.' This will generate the sensitivity report shown in Exhibit 10.8.
Reduced Costs are the most basic form of sensitivity analysis information. The reduced cost for a variable is nonzero only when the variable’s value is equal to its upper or lower bound at the optimal solution. In this example problem, all variables have a lower bound of zero (i.e. a non-negativity constraint) and no upper bound. Moving the variable’s value away from the bound (or tightening the bound) will worsen the objective function’s value; conversely, “loosening” the bound will improve the objective. The reduced cost measures the change in the objective function’s value per unit increase in the variable’s value. In the example Sensitivity Report above, the dual value for producing speakers is -2.5, meaning that if we were to tighten the lower bound on speakers (move it from 0 to 1), our total profit would decrease by $2.50.
The Shadow Price for a constraint is nonzero only when the constraint is equal to its bound. This is called a binding constraint, and its value was driven to the bound during the optimization process. “Tightening” a binding constraint (making it more strict) will worsen the objective function’s value; conversely, loosening a binding constraint will improve the objective. The Shadow Price measures the change in the objective function’s value per unit increase in the constraint’s bound. In the example report above, increasing the number of electronics units from 600 to 601 will allow the Solver to increase total profit by $25.
Excel Solver For Mac Nt Generating Sensitivity Reports
The Allowable Increase and Allowable Decrease fields in the report show the range of increases and decreases for which the Reduced Costs and Shadow Prices remain constant.
Excel Solver Not Working On Mac
-->Tells Microsoft Office Excel what to do with the results and what kind of report to create when the solution process is completed.
Note The Solver add-in is not enabled by default. Before you can use this function, you must have the Solver add-in enabled and installed. For information about how to do that, see Using the Solver VBA Functions. After the Solver add-in is installed, you must establish a reference to the Solver add-in. In the Visual Basic Editor, with a module active, click References on the Tools menu, and then select Solver under Available References. If Solver does not appear under Available References, click Browse, and then open Solver.xlam in the Program FilesMicrosoft OfficeOffice14LibrarySOLVER subfolder.
SolverFinish(KeepFinal, ReportArray, OutlineReports)
KeepFinal Optional Variant. Can be either 1 or 2. If KeepFinal is 1 or omitted, the final solution values are kept in the changing cells, replacing any former values. If KeepFinal is 2, the final solution values are discarded, and the former values are restored.ReportArray Optional Variant. The kind of report that Excel will create when Solver is finished:
When the Simplex LP or GRG Nonlinear Solving method is used, 1 creates an Answer report, 2 creates a Sensitivity report, and 3 creates a Limit report.
When the Evolutionary Solving method is used, 1 creates an Answer report, and 2 creates a Population report.
When SolverSolve returns 5 (Solver could not find a feasible solution), 1 creates a Feasibility Report, and 2 creates a Feasibility-Bounds report.
When SolverSolve returns 7 (the linearity conditions are not satisfied), 1 creates a Linearity report.
Use the Array function to specify the reports you want to display — for example, ReportArray:= Array(1,3).OutlineReports Optional Variant. Can be either True or False. If OutlineReports is False or omitted, reports are produced in the 'regular' format, without outlining. If OutlineReports is True, reports are produced with outlined groups corresponding to the cell ranges you've entered for decision variables and constraints.
Example
This example loads the previously calculated Solver model stored on Sheet1, solves the model again, and then generates an answer report on a new worksheet.
Excel Solver For Mac Nt Generating Sensitivity Report Example
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Excel Solver For Mac Nt Generating Sensitivity Report Analysis
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