Creating Proper Constraints To Create Solver Model?
Apr 11, 2014I want to take a shot at this spreadsheet exercise. Setup similar spreadsheet models.
Excel Exercise.xlsx
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Multiple Solver Constraints In Solver
Sep 10, 2006I have a cell, D5, which is the sum of three other cells, A5 B5 and C5. (all currently empty). Cells A1 through C4 are filled with various numbers.
What I've been trying to do is use solver to say: Make D5 equal 200, do it by manipulating only A5 B5 and C5, and make it subject to the constraint that A5 must equal a value selected from A1:A4, and B5 must equal a value from B1:B4, and C5 ...etc. I have deliberately set it up so that there is only one solution.
I was doing fine until trying to create the constraints. How can I make a constraint that says "this cell" must equal "one of the following cells"? And if I can't do that, is there an alternate method of achieving the same result?
Optimal Combination Model With Constraints & Variables
Aug 11, 2008I need to optimize an Excel model with 5 variables each of which cam be any value from 1 to 20. The solution space, therefore, contains 3,200,000 combinations. I have a software(Palisade Risk) which can give out a random sampling of this solution space. I need to know how many combinations can be considered as a representative sample of this solution space - e.g. can it be 1%?.
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Mar 26, 2012I want to set constraints as an integer in solver. But I don't know how to do it.
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Mar 9, 2008I was able to find a solution using the excel solver add in but unfortunately it cant take more then 200 constraints and hence gives an error. I am unable to find a different approach to this problem.......
View 9 Replies View RelatedSolver With Constraints For Inventory Levels
Nov 9, 2008I have a maximization problem. I have to maximize Kitchen Sets given available materials. I have 11 different Kitchen Sets and every set requires different material.I have attached an excel spreadsheet for making the problem more clear.
I have T1;T2;T3;T4;M1;M2;M3;M4;O1;O2;O3;O4;Z1;Z2;Z3;Z4 different materials. Every kitchen sets requires one material from T which is fixed (for example T2), one material from M which is fixed again (for example M3), one material from O which is fixed (for example O1) and one material from Z, which is fixed (for example Z4).To complete a set the sum of all materials used should equal to 4. I have some constrains T1+T2+T3+T4<=2 it is the same for M1+M2+M3+M4<=2, O1+O2+O3+O4<=2 and Z1+Z2+Z3+Z4<=2.
So basically my goal is to say which materials should I keep in stock in order to maximize the Kitchen Sets.
VBA Solver: Find Minimum Value Of Cell By Changing X Cells With Constraints
Mar 18, 2009I'm trying to use solver to find the minimum value of a cell by changing 5 separate cells. These cells are subject to a set of constraints that are formulae. On top of that I have a large number of these solve's to run (The spreadsheet is creating randomly distributed data to form a Monte Carlo simulation). Therefore I am referencing the formulas using the ActiveCell, Offset() function. For some reason when running this code none of the values are changed. Also I changed the UserFinish to false so I could see what solver was doing at each solve, It stops at the correct cell (one after the final cell) but without me having to confirm it each time.
Here is the ....
Solver With Code-Generated Model
Dec 14, 2009Suppose that you have some data points and you want to fit a straight line to them. You write the line's equation in the cells ajacent to your data points, make the square of each difference, sum up all the squares and you have your objective function. Of course your line equation depends on two parameters, that you enter in two cells. Then you run the Excel Solver, enter your objective function as target cell to minimize, enter the range containing your parameters, set your constraints and off you go.
So far so good.
And now suppose that in order to generate your model data it is not enough to write a straight line equation in some cells, but rather to run a complete reactor model (contained in a macro). How do I couple that model-generating macro with the Excel Solver? Now, I actually found a solution. I wrote a Worksheet_change macro in the sheet containing the model parameters, which calls the model-generating code each time the parameters are chenged by the Excel Solver. This has worked fine for a simple example as the straight line one.
Now one of the two:.....
Creating Files To Automatically Determine Proper Entry
Jan 1, 2009I have posted about creating an Excel worksheet which would help determine proper entry into a retirement plan. Another idea that I had entailed setting up a separate worksheet which would return the dates of entry following an employee's date of hire. Therefore, an employee hired on 8/5/2005 would have dates of entry following that stand at 1/1/2006 and 7/1/2006. Then, I had an idea of creating a formula or function to add up the number of hours that the employee had worked.
Setting up a separate worksheet with the number of hours that an employee worked during the initial eligiblity computation period and the subsequent computation periods (separate respective columns for the initial eligibility computation period and then for each subsequent computation period) would help. I would calculate using sum functions.
So, to sketch this out:
One sheet would have the employee's DOH
Another worksheet would have the Dates of Entry subsequent to that DOH (e.g. for an employee hired 8/5/2005 the next Dates of Entry entails 1/1/2006, 7/1/2006, and 1/1/2007)
Yet Another Worksheet would sum the total hours that an employee had worked since DOH on a month by month basis (i.e. the total number of hours than employee had worked since his or her DOH up to a certain point on a monthly basis; e.g. an employee hired on 8/5/2005 would have on the sheet the calculation of the hours this employee had worked as of from 8/5/2005 to 9/1/2005, then the next column would have the total the number of hours worked by the employee from 8/5/2005 to 10/1/2005, etc.)
Finally, the worksheet with the DOH information would have a column which would (this would probably entail heavy use of VLOOKUP) snag the information as to how many months and years an employee had worked as of the subsequent Dates of Entry; if the employee had worked 1,000 hours and 12 months as of 1/1/2007, for example, the employee would enter the plan.
To explain the situation further:
The employee must work 1,000 hours during his or her initial eligibility computation period. That starts on the day of the first hour that an employee works for the company. So, an employee hired on August 1, 2005 who worked one hour on that day must 1,000 hours from then till August 1, 2006 to enter the plan as soon as possible. If the employee did not work 1,000 hours during that period, then the eligibility computation period shifts to the plan year. So, if the employee did not work 1,000 hours between August 1, 2005 and August 1, 2006, but did work 1,000 hours between January 1, 2006 and December 31, 2006 (this of course presumes the plan operates on a calendar year)
Using VBA In Patch Model To Change VBA In User Model
Jan 11, 2007I have some Excel models out in the field with some old VBA code that is now causing problems. I regularly develop 'patch' models to make updates or repairs to user models, but need the VBA code syntax to get into a Worksheet module and change one line of VBA code.
The worksheet is named 'Forecast' and I need to change line 5 of my VBA code.
The vast majority of my users are on Excel 2000. I remember the security issues with newer Excel versions and can walk then through that, but I forgot the code syntax I need to get the job done.
How To Use Solver Add-in Then To Create Own Data Analysis Code
Nov 18, 2011Is it easier to use the Solver Add-in than to create your own data analysis code? We are planning to design a scheduler for around 12 technicians in our contact center (doing phone support).
View 5 Replies View RelatedSolver Solver To Calculate Through VBA
Jan 12, 2007I have to use use the solver to calculate something (a mean-variance framework).
I am using the solver to minimize a cartain cell (variance) by making two cells equal through (expected return) by varying 10 cells( weights of assets), but I have to repeat this for 500+ times (for different expected returns).
Someone told me that I could best use some sort of loop through VBA. But I don't have a clue how that works.
Creating VBA Code That Uses Input From Users To Create A Calendar
Sep 18, 2012Modify Macro3 and use the InputBox function twice so that Macro3 would ask the user for a particular month and a particular year; and then Macro3 uses these user’s inputs to create the calendar template for that month of the year. For example, if the user enters February for the month and 2012 for the year, Macro3 would create a new
VB:
Sheets("Template").Select
Sheets("Template").Copy After:=Sheets(1)
Sheets("Template (2)").Select
Sheets("Template (2)").Name = "January"
[Code]...
Maximize Value Within Several Defined Sets Of Constraints?
Jul 22, 2014I am trying to maximize fantasy football points based on projected points scored, salary and positional limits.
I have multiple sheets dedicated one per position (i.e. sheet named "QB", sheet named "RB", etc.). The relevant columns are: Name; FPT (projected points); Cost
NOTE: I have combined all the data into "sheet1" if necessary.
I need a VBA program or Solver to diagnose the largest possible combination of projected points based on the following constraints:
Constraint 1: Total value must be less-than or equal to $1,000,000
Constraint 2: Total players used must be equal to 10
Constraint 3-?: Of the 10, 2 must be QB, 2 must be RB, 2 must be WR, 1 must be TE, 1 must be DEF.....the other 2 can be RB, WR or TE
Obviously, each player can only be used once and I'm not sure if Solver can abide by that constraint, nor do I know how to apply the others. I'm thinking VBA could work, but I'm not familiar enough with the language to hammer out the code.
I have a small macro that downloads some data from a website and tweaks it Daily fantasy cheatsheet.zipa little, but I hope that won't affect any computations involving those values.
Calculate Time Spans With Constraints
Dec 20, 2006I need to calculate time period worked between 19h00 and 24h00 in following exemples,
start time 08h00 and End time 20h00, would be 1 hour
start time 20h00 and End time 08h00, would be 4 hours
I can't get IF fonction to work with times..
Calculate Time Difference With Constraints
Sep 30, 2007i've two time constraints with 22:00~6:00 and 6:00~22:00. i'll apply time span to two constraints,calculate time covering on two constraints. it will start at anywhere of 00:00~24:00, time span will be 00:00 ~24:00. i add some formula, a3=start time, b3=end time. time constraints with 22:00~06:00:
=IF(AND(A3<=22/24,B3>=6/24,A3>B3),8/24,IF(AND(A3<6/24,OR(B3>22/24,AND(B3>0,B3<6/24,A3>B3))),IF(B3>=22/24,(B3-22/24)+A3-6/24,(B3+1-22/24)+MOD(6/24-A3,1)),IF(AND(OR(A3>=22/24,A3<B3,A3=0),B3<=6/24),IF(OR(A3=0,A3=1),B3,IF(A3>B3,B3+1-A3,B3-A3)),IF(AND(A3<=22/24,B3<=6/24),MOD(B3-22/24,1),IF(AND(A3>=6/24,B3<=22/24,A3<B3),0,IF(AND(A3>=22/24,B3>=6/24),(1-A3)+6/24,IF(AND(A3<=22/24,B3>22/24),B3-22/24,6/24-A3)))))))
time constraints with 06:00~22:00. :C$3=start time,$B4=end time...............................
List Possible Combinations With Conditions/Constraints
Aug 9, 2008I am trying to write VBA code that will list all possible combinations of data contained in a worksheet based on a few conditions. I have a list that varies in length. In the first column is a list of numbers denoting a particular course number. In the second column is a list of numbers denoting the specific class number for the course. As an example, I have a 6 courses. The first course has 1 class, the second course has 3 classes, the third has 11, the fourth has 3, the fifth has 7, and the sixth has 6. Thus, my columns look like this:
A B
1 1
2 1
2 2
2 3
3 1
3 2
3 3
3 4
3 5
...
I need to list out all possible combinations of classes given that I must have all six courses. EXAMPLE (Course, Class):.......................
Create Report Using Power Pivot While Creating Relationship Between Linked Table?
Apr 24, 2014I want to create a report using power pivot while creating the relationship between the linked tables, power pivot is throwing error "The relationship cannot be created because each cilumn contains duplicate values. Select at least one column that contains only values"
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Jun 24, 2014I am trying to create a macro that will create a number of check boxes, which are linked different cells. I have had some success in creating multiple check boxes and having them at the destination I want the problem is that instead of linking to different cells they are all linked to the same cell. I have attached a sample workbook SAMPLE.xlsx
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Jul 9, 2014Whenever or not I should use VBA or ordinary formulas in Excel in order to do Vehicle Routing With Two-Dimensional Loading Constraints case. What I need is when I have coordinates of four bottom-right corners:
X Y
24 0
30 0
10 24
8 38
2L-CVRP, what I want to know is: In reality I have set of 200 coordinates (x,y) and I need to search for lowest y (its (24,0) and (30,0)) then I choose one with maximum x ((30,0) in this case). Then if for some reason item cannot be packed there, then I shall go to next lowest y, which is 24 giving coordinate (10,24), if I cannot use this corner, I search for next lowest y with as high x as possible, etc. BTW I use Evolver in order to find satisfying solution.
Pop Up Textbox In Data Validation In Protected Spreadsheet With Certain Constraints
Feb 17, 2009This is the code where you click on a cell that has been input from Data Validation, it gets a pop up textbox showing the text input. One drawback I see here is that when the sheet is protected, one needs to tick 'Edit Objects' in 'Allow all users of this worksheet to:' window to get the textbox to pop-up otherwise no textbox is shown.
So this leads to the accessed user to have the ability of deleting and moving the textbox in the protected spreadsheet. Do you have any idea to Protect the sheet, Get the textbox to pop up,
Disallow user to delete/move the textbox.
Adding Constraints To Averaging Formulas Over Multiple Cells
Nov 20, 2009I have data for 500 companies over 10 years, in three criterions: “EPS”, “DPS” & “PX” (i.e. earnings, dividends and price).
For each company I have four lines recording the data, and given a letter code indicating how the change in dividends and earnings have been according to the following
(Examples)
DD-ED = Dividends Decreased & Earnings Decreased
ND-EI = No Dividends & Earnings Increased
As can be seen below this code is present for each company
What I need help with is some sort of lookup function which takes the average of the price changes (which is given in numerical values) only for the companies which code is equal to the code in the reference field.
So something like: =AVERAGE(IF((MOD(ROW(D2:D2353)-ROW(D2)+1,5))=0,IF(D2:D2353"",D2:D2353))) (currently counting every 5th line, since there is 4 lines between respectively PX/DPS/EPS for each company) –But with a constraint indicating only to include the value in the calculation if the codes are the same (e.g. "DI-EI" = "DI-EI").
So that the value, which is currently 20.96% (which now includes ALL price values), would only include those for the respective group (in this case, companies in the DE-EI group).
Solver- When Solver "changes Cells"
Jan 21, 2009I want to use solver program. But when solver "changes cells" i want it to trigger my pivot tables in the workbook. So i added the code to my worksheet:
Private Sub Worksheet_Change(ByVal Target As Range)
ThisWorkbook.RefreshAll
End Sub
So when a change occurs, all my pivot tables will get refreshed and my data will change. Is solver able to trigger this event while solving an optimization problem?
Difference Between Dates & Times In Business Days With Time Constraints
Aug 16, 2009I need to create a spreadsheet that will calculate the difference between two dates and show the result in days. The complicated part is that weekends (Sat and Sun) need to be ignored and any time after 4:30 pm needs to be treated as the next business day. I have been trying to look at similar questions in forum and use the WORKDAYS function with little success.
Example:
A1- 14/08/09 4:40 p.m.
B1- 17/08/09 9:10 a.m.
I need the answer (B1-A1) to show up as 0. But if the time in A1 was changed to 4:20 p.m. than the answer should be 1 day.
Model For Payment Schedule
Aug 20, 2013I'm currently developing a model for a payment schedule. For example, lets say a customer purchases an item from a store, but the store receives that payment in the following month. I'm looking to develop a dynamic model so that if I change the assumption from 1 month to another term (2,3,4+ months etc.) the model will adjust accordingly.
I've started with a formula
=IF(MONTH(H3)-MONTH(G3)=B14,G11*B13)
But of course this will not work once the term is set to larger than 1 month. With B14 representing 1 month, and G11*B13 being payment information (price * quantity).
Change Model To Category?
Apr 13, 20141. In column A, I have models, in column B, I want to place either a "printer" if the model begins with Phaser or Laser, and if it begins with WorkCentre make it MFD. Also, if the Phaser has MFP on the end, make this an "MFD" and If Color 560 or Docucolor, make this "Out of Scope". How do I read the first part of the string in column A to do this, or do I need to make a second column with this Phaser and WorkCentre broken out?
I have this code attached, but only works if I have the word Phaser or WorkCentre.
Spreadsheet Model & Buttons
Dec 20, 2006I want to create a button on this spreadsheet - the button will be called z4 in the "Yr 9 ICT" sheet
it will include the following
rows Jane Bloggs 2
rows Jane Bloggs 12
rows Jane Bloggs 22
rows Jane Bloggs 32
rows Jane Bloggs 33
rows Jane Bloggs 42
rows Jane Bloggs 44
rows Jane Bloggs 66
What do I have to do to create this.
Time Model Graph
Jul 1, 2007I have a sheet with a table of peoples hours they are doing during the week each day. I want the hours to be put into a model shading the appropriate times to show when people will be in. I have attached a sample sheet of what i want it to do which i have had to do my self. Sheet 1 has table in and sheet 2 has the model i want to be automatically filled in once ihave entered all my data in the original table.
Simulation Model For Inventory
Nov 15, 2006I am having a very difficult time determining how to get started with this problem in VBA. I am not sure how to generate the failures, or start the array. I have been racking my brain for quite some time. Company B makes a product that has two component parts. The results of reliability testing for each component shows that the components fail according to an exponential distribution with the following mean time between failure (mtbf).
ComponentMTBF(months)
115
224
Below are Company B's sales records for the past 36 months.
MonthSalesMonthSalesMonthSales...............................
Formula For A Deferred Revenue Model?
Dec 27, 2013I have a deferred revenue model. Revenue from each month earns out at an equal rate over twelve months. Sales for each month are in column B (B21) and C. I created formulas for the first year but when I get to the second year, I'm not sure what to do, because the earned premium will include values from previous year sales and current year sales.
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