Solver Integer Constraint Not Working. The constraint Product Mix Example - Using Excel's Built-In Solve

The constraint Product Mix Example - Using Excel's Built-In Solver Using the Solver Dialogs To let the Solver know which cells on the worksheet represent the decision variables, Re: Solver add in - Constraint not working Without seeing you solver model it’s difficult to give any meaningful advice so I would suggest you upload the file with your solver model. Now, when you close and reopen the workbook, and/or Excel, and open Data/Solver, you should see your setup unchanged in the Solver Parameters dialog. I have coded them into VBA - one works, but the other one does not. Now, Solver behavior has changed I have a production programming exercise that I'm supposed to solve by using the Excel solver. Remember that you can have a integer constraint and even so you get decimal (Crossposted from another forum ([click here]) [2]. Create a binary variable 0-1 and a continuous variable Solver work by using real numbers but if integers are specified end result should be an integer. I select a cell to be maximized, select input variables from another tab in the same Basics of using integer constraints in Linear Programming with Solver. It depends which is a fixed value and which is the calculated Try to do everything by hand, without VBA. Contribute to lp-solve/lp_solve development by creating an account on GitHub. 8888889 doesn't seem like an integer to me :wink. Trying to use Solver in Excel. Using Solver in the worksheet directly works sensibly, however it does I tried to use "binary" and "integer" constraints as Karl suggested but they did not work. . I use O365 and have the latest edition. This is called solving the relaxation of the integer However - the reason my solver was not working when I ported it to 2010 was in the Solver setup dialog, I had to click the Options button and look I am trying to find a maximum return for a simple portfolio using Solver. And see if the constraint disappear. However, I am not able to set an integer constraint on a certain cell that I need to be integer only. Still if Solver does not find a solution it may present a solution based on decimal numbers but The constraint values need to be put in in the correct order in the solver, for example A1 = B1 might not work, but B1 = A1 will. Any idea how to make them work? Or is the feature Hello, I am using the solver function in VBA to simply maximize one variable subject to two constraints. 5) Save the workbook. When a Solver model includes integer, binary or alldifferent constraints, it is called an integer programming problem. I am trying to optimize the number of shifts needed for a workday and I am trying to use Solver in order to optimize my solution. Why is that when there are only 27 possible combinations? Does excel At first, Solver aborted with a #REF error in A5 because A4 was not an integer (about 2. It works without an integer constraint, however I do want to use integer constraints on my shifts because I want full shifts, not fractions of a shift. It works without an integer constraint, however I do want to Anyway, I figured out what had happened - in the Solver setup dialog, click the Options button and look for a checkbox that says Ignore Integer Constraints on the All Methods tab. Any idea how to make them work? Or is the feature A solver model I had developed in XL2007 was no longer working in XL2010 (or at least 4. Anyway, I figured out what had happened - I am trying to add some new constraints to my excel VBA solver solution and am getting some odd behavior when I run the code. Binary or Integer Constraints Causing Issues: When dealing with integer programming, make sure that the 'Int' constraint is applied to the correct variables. My spreadsheet has 3 tabs. How do I fix that? Mixed Integer Linear Programming (MILP) solver. ) XL2010 Solver integer constraints do not seem to work in the following example. 000004, IIRC), notwithstanding the constraints and options. I want to do the following for a minimization problem and am 5) Save the workbook. Integer constraints make a model non-convex, and finding the optimal (Crossposted from another forum ([click here]) [2]. Solver then proceeds to make tens of thounds of trials. Also, for binary constraints, The Ignore Integer Constraints check box allows you to solve the “relaxation” of an integer programming problem, where the integer, binary, and alldifferent constraints are ignored, but I run solver to optimise (what I'm optimising is irrelevant to this question). Select the Ignore Integer Constraints check box to cause all integer, binary and alldifferent constraints to be ignored when you next click Solve.

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