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tutorial WIN QSB (guia)
tutorial WIN QSB (guia)
tutorial WIN QSB (guia)
tutorial WIN QSB (guia)
tutorial WIN QSB (guia)
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tutorial WIN QSB (guia)

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  • 1. Using WinQSB to solve Linear Programming Models Assume we wish to solve the transship problem depicted in the following network diagram First, formulate the model in standard 50 1 2 LP form. All constraints must have 8 5 35 variables on the left side and a constant 4 60 2 4 9 on the right. 5 6 25 40 3Minimize Z= 2x14 + 4x24 + 5x34 + 8x45 + 9x46 From the transshipment node: 1 unit of output requires 2 units of inputSubject To: x14 <= 50 x24 <= 60 Now you are ready to x34 <= 40 move to the software. x45 = 35 From the WinQSB software set select “Linear x46 = 25 and Integer Programming” x14 + x24 + x34 – 2x45 – 2x46 = 0
  • 2. 2. Complete all1. Under the parameters. For theFile drop-down example problem,menu, select the completed“new problem” parameters willand this dialog appear as followsbox will appear 3. After selecting OK the Spreadsheet form will appear on the screen
  • 3. 2. The column headings reflect our new variable names1. Rename the variables.Select “Variable Names”under the “Edit” pull-down menu and type thenew names in the white 4. The lowerBoundcolumn. of each variable should be 0 and the UpperBound should by M (short hand for very large) 3. Enter the objective function (row 1) and the six constraints (rows C1-C6). The spreadsheet cells contain the coefficients of each decision variable in the objective function and each constraint. 5. For larger models, the spreadsheet format may be difficult to use. In these cases, switch to the normal model format in order to type the constraint set and objective function. Select “Switch to Normal Model Form” under the “Format” pull-down menu. The input screen changes to the following:
  • 4. Normal Model FormatTo solve the formulation select “solve theproblem” under the “Solve and Analyze” pull-down. Alternatively, select the running man icon
  • 5. Don’t forget to saveSolution and post the formulation byoptimality report selecting “Save Problem” from the “File” pull-down. You will be best served to use the software on your own computer system. However, if you use the lab, note that the lab’s network may have trouble printing the solution. You may need to copy and paste a “print screen” into a package (such as Word) to print your complete solution

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