A solution of -3 50mg vials and 1 150mg vial might be cheaper (negative, actually), but it’s not an option at most stores I shop at. Make Unconstrained Variables Non-Negative makes sure that variables like Quantity don’t go negative when Solver tries to find a solution. The second is that the Total Dose ( D5) must be greater than (or equal to) the dose the patient needs ( E7). The first is that our Quantity values must be integers (we can’t buy half of a vial). You can also specify that a number must be an integer or a binary. You can specify operands like “=” (equal to), “>=” (greater than or equal to), etc. Subject to the Constraints: is where we set the rules of the game. In this case, the cells we need to change are the Quantity cells in C2:C4. In our case, we are trying to Min the objective.īy Changing Variable Cells: is where we can specify the conditions that we want to change to reach our objective. To: is where we specify whether we want to Maximize the objective, Minimize the objective, or make it as close as possible to the Value Of the input. In our case we are trying to optimize the Total Cost so we select cell E5. Set Objective is where you input the number you are trying to optimize. We’ll walk through the setting step-by-step… This is Command Central for the Solver plug-in, where it accepts all the settings it needs to work through the problem. The Solver Parameters dialog box will open up. Click on the Data menu tab and click on Solver on the far right. Now that we have the basic layout designed, we can open Solver. The formulas for the Dose and Cost columns, as well as the Totals are as follows: Amount of medicine needed by the Patient.Total Dose for each size (Dose x Quantity).It needs to show all the variables of the problem: We need to lay out the medicine vial options with a table of information. If it is there, we’re ready to build our spreadsheet. To make sure that it has installed properly, look in the Data menu tab at the far right and find the Solver button. In the Add-Ins dialog box that opens, check the box next to Solver and click OK. Make sure Excel Add-ins is selected and click Go… Installing Solverīefore we can start working on this problem, we need to make sure Solver is installed in Excel.Ĭlick on the File menu and click on the Options button.Ĭhoose the Add-ins section on the left, and go down to the Manage: drop-down menu. The challenge is to build a spreadsheet that will calculate the lowest cost combination of medicine vials, based on what a patient needs. The bigger sizes come at a discount price to the smaller ones. In this scenario, medicine is sold in 3 different size vials: 50mg, 150mg, and 450mg. Let’s walk through an introduction to Solver and work through an example… The Problem Fortunately, Excel has an official Plug-in called Solver that can do amazing things to solve optimization problems like this. This is a problem that would be very challenging to solve with basic IF statements and arithmetic formulas. Buy too much, it will be wasted, and that won’t save you money at all. Bigger sizes come at a discount, which can save you money. Imagine you’re faced with a purchasing problem… You need to buy some inventory that comes in multiple sizes. #Simplexlp solver excel download6To Download the Sample Worksheet, Click Here.5Running Solver and Checking the Output.
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