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Hello, for a submission I just had to download AIMMS. I have applied for the Academic License to use it. After I received the verification mail, I proceeded exactly as described in the mail. However, I still can't really use AIMMS because I always get the following error message when creating a new project. As soon as I want to open another project, I also get an error message. When I want to implement a new model I can't add new sets, parameters etc. either. Any help is highly appreciated! 

I have a Binary Variable X(C,V,T).Suppose for  t  and v  , X(c,v,t) is 1 for a c1  in C.I have another element parameter/variable (Range in C) F(V,T).now using this variable X how can i find F(v,t) = c1    

Hi, I these days, I realized a new limitation with the new academic license delivery. Before, I was able to run two instances of AIMMS at the same time. However, now I can only run one instance at a time. Here are my two main uses for parallel instances of AIMMS:I am dealing with a quite heavy energy system model that runs around 2 to 20 hours (depending on the level of details). Sometimes I need to run several scenarios for a specific sensitivity analysis. It would be very useful for me if I can run the model on several computers at the same time. Sometimes I want to continue coding in AIMMS while it is running a problem.  Would it be possible to run two or more instances of the model at the same time for academia? 

I looked into the example of the dex:: library and I tried the DataExchange example. However I still have trouble to get started in my own program. I want to read a JSON file like given in the attachment and use the data in some variables in my AIMMS program. Could someone help me with a simple example program?

Hi, I used to watch two aimms videos, one of them was about performance tunning of problens and the other was about infeasibility of models, but after the chanegs in the site I cannot find then anywhere. Doesn anyone remember of these videos and where to find them?

Hi everybody, I am trying to convert the unit power [MW] into the unit energy [MWh] considerung the specific time duration per timestamp [h] or [qh]. Has anyone an idea how to solve that?

I want to write data in Excel. Generally “Spreadsheet::Assign...” commands work fine. However, I fail to include zeros in the output in Excel. I want this:i/t 1 2 1 0 0 2 5 7  I get this:i/t 1 2 2 5 7  Now I found the “axll::”  library and the axll::WriteTable command, which seemed promising. Unfortunately this seems to work differently, since commands need an open workbook, which the “spreadsheet::” commands don´t. Combining both worlds doens´t work either.  Can someone help? I am very confused. Thanks

Dear All,I want to write an equation for calculating growth in a parameter or variable. As an example:Pop(t) = Pop(t-1) + GrowthFactor(t)*Pop(t-1)How to do this inside AIMMS?Thank you.

Looking at screenshots can anyone tell me why the element parameter Calc(i,t) is not getting calculated? The problem comes when I am using ‘shift’ unit of measurement. If I use standard units like day or hour, the element parameter gives correct answer.I need the data of element parameter to be as follows: For example for t=2021-03-01 00:00 answer for b1: 2021-02-01 08:00 (since we are deducting 2 shifts) and for b2: 2021-02-01 00:00 

I want to get registry value to check for dll registration.Is is possible in AIMMS?Please help me.

Hi,I am working on a project of delivery planning.In my model i have a constraint which defines the Unavailability of a vehicle for some time due to maintenance or already on a delivery. The Time a vehicle becomes unavailable is a parameter.the constraint is :Here,X_v,t → indicator variable for maintenance(whether need to go for maintenance)S(v) → time required for maintenance of vehicle v status_v,t → indicator variable for availability of vehicle v on day t   I am unable to write it in AIMMS. how to get the range of tau ?i was able to get the range for a single value parameter h using SubRange function                             tau in SubRange(T, t, t + h)but for a parameter set S SubRange is not working. Writing S(v) in place of single valued parameter h giving me  this error*There is a mismatch in the master sets of set "T" and domain set "S" in the first argument of the call to intrinsic function "SubRange". what could be a possible solution for writing this constraint if S(v) i

If I have a variable where row A is timeline with index t and B are calculated values, how to calculate Non-zero Average of Values in B?A 1 2 3 4 5 B 4 0 6 0 7

I want visualize stock levels with their respective safety stock level. I have 2 parameters running over products and weeks. See below. The bar is good, but the lines are connected insead of different per product.   Is there a way to fix this?

 I have large a planning problem in AIMMS, which is linear optimization. I am using GUROBI 9.0 for solving it and the solver is set to use the Barrier method based on our experience that Barrier converges faster than Simplex in our large-scale problem. After around 56 hours, the program stopped and I got the “Warning: Model status 13: Error no solution, solver status 1: Normal Completion”.Here are screenshots from the warning and progress panels of AIMMS.  Error/Warnings PanelProgress Panel​​​​​None of the existing questions and discussions on “Warning: Model status 13” are related to the case that it says “Solver status 1: Normal Completion”. I could not find any more information on software or the AIMMS manual regarding this issue. I need to find what is the source of this problem. I would be grateful if you can help me with this issue.Thanks,

hi all,sorry for the trivial question but was trying to figure out:how to force aimms to show “0” values for parameters and variables/results and correspondingly exporting those parameters to excel with “0”at the moment, whenever the parameter or variable has “0” is appears as empty line/cell.any hints on these two questions much appreciated!thanksnick

Good morning.I am converting our proyects in AIMMS from version 3 to version 4 and the DSN that already was used to connect to Access has failed. I used the extension (*.mdb), also tried with  (*.accdb) but doesn´t work. Could you help?Thanks a lot

Hi,I want to write a floor function in my model.Or how to get floor value of a fractional number?how can i write that in AIMMS?

I am a beginner to AIMMS and was trying to create the Softdrink Planning model by following the procedures in AIMMS_tutorial_professional.pdf. However, I was stunk at specifying the table name attribute step in tutorial page 77/217. Whenever I click the “Table name” wizard, a window will pop up saying “Error opening datasource data\\Softdrink Planning.dsn make sure this is a valid datasource”. Anyone knows how to solve this issue? Your help would be highly appreciated!I also tried to click the “Table name” wizard in the completed project model but I still have same issue.

While calculating a Sum-Function  I encountered a problem  (see error message below):While using the power of X=1 and X=2 the model works perfectly however with any other number (also negative numbers) it displays the error below in red.Function: Sum[p, 2 * (L1(p)+0.001)^(X) ] Using +0.001 to avoid any division by 0 (in case of X being negative).L1(p) being a variable which is defined by a constraint L_1(p):Sum[i,L(p,i)] + L1(p-1)= L1(p)And L(p,i) in the constraint being a binary parameter. To run AOA the name of the AOA callback procedure should be assigned to suffix 'CallbackAOA' of 'Loesung'. For example: Loesung.CallbackAOA := 'OuterApprox::BasicAlgorithm'; where 'OuterApprox' is the prefix of the Outer Approximation module.Warning: Model status 13: Error no solution, Solver status 10: Error: Solver failure (see message window).Thank your for any help.  

I’m looking for help to extracting the first and last value of a given list. I have a binary parameter L(p,i) which will be given varios list of data.For example:List p=1: i=1 → 0i=2 → 1i=3 → 1i=4 → 0List p=2:i=1 → 1i=2 → 0i=3 → 1i=4 → 1I’m looking for a command which will extract the first i which is set to 1 on a given list. In this Example for the list p=1 it would be i=2 and for the list p=2 it would be i=1.I’m also looking for a command which will extract the last i which is set to 1 on a given list. In this example for the list p=1 it would be i=3 and for the list p=2 it would be i=4.I tried the “First” and “Last” command which always lead to using i=1 (for the command “First”) even though in the example p=1 the value of i=1 is 0 and not 1.Any help would be appreciated. 

I am getiing an error :The undeclared "1" is not an index. I am on the declaring identifiers portion of the course building my 1st AIMMS app.

I have been trying to import the phasing in capital data which is in the attached Excel file. I have added the identifiers on the attached word file. The data I am importing has numbers which I want AIMMS to convert to percentages.On my side the PhasingInCapital is a worksheet inside the Input Data workbook. Here is the error:ExcelSetActiveSheet(Input Data.xlsx, PhasingInCapital) failed: Workbook doesn't contain the specified sheet. Invalid index.I have imported a lot of data files from Excel, I am not sure what am I doing wrong this time.Please assist.

While solving a LP, I ran into the following error.  Below some snapshot from the message window.  100   9.7583200e+09   9.7583173e+09  3.89e+00  1.71e-01  1.34e-05  2.65e+03 101   9.7583195e+09   9.7583194e+09  5.20e+00  6.76e-03  6.16e-06  6.06e+04 102   9.7583195e+09   9.7583195e+09  1.78e+01  1.72e-04  2.39e-06  3.28e+06Barrier time = 767.38 sec. (945691.46 ticks)Parallel mode: deterministic, using up to 4 threads for concurrent optimization: * Starting dual Simplex on 1 thread... * Starting primal Simplex on 1 thread...Dual simplex solved model.Compressing row and column files.Advanced basis not built.Total crossover time = 300.28 sec. (132581.11 ticks)Total time on 4 threads = 1136.34 sec. (1101932.44 ticks)Memory in use by CPLEX 12.10.0.0: 8662892544 bytes.There is 8.26e+03 Mb in use by CPLEX 12.10.Warning: Model status 13: Error no solution, Solver status 10: Error: Solver failure.I am wondering if dual simplex solved the model, why there is error no solution?Any ideas to troub

A very basic question from a new user:I am trying to get started in the foundational training. When I create a new project to follow the basic tutorials, I am unable to create a new variable (though I can create sets and parameters). There is no error message that appears, but the buttons are grayed out (see screenshot below). I have tried in several AIMMS versions. Can anyone tell me what's going wrong here?

I want to write a function in AIMMS which should return a value or an element of Set X(say).The function is say F(a,b,x) where a in A, b in B, and x in X. The function F should return an element(or value) x1 from set X if x1 is in X otherwise returns no value.for Example, say F(a,b,x) = x - 10 and X = {x | 0<= x <= 100}F(a,b,20) should return 10  and F(a,b,8) returns no value or a default value which AIMMS will not consider when using this functions return value in a constraint.