Optimization Tooling

Dear,I am trying to use aimms.py in order to run a AIMMS model from python and parse and receive output. I created the following python script based on the package: aimmspy · PyPI. import osfrom aimmspy.project.project import Project, Modelfrom aimmspy.utils import find_aimms_path aimms_bin_path = r"C:\Users…..."project_file = r"C:\Users…..aimms"# input_file = r"C:\Users....txt"results_file = r"C:\Users....csv" project = Project(    # path to the AIMMS Bin folder (on linux the Lib folder)    aimms_path=aimms_bin_path,     aimms_project_file=project_file,    license_url=R"wss://licensing…….."

Hello, I am trying to read a db file on Cloud but it is showing the error attached herewith.Description:I have created a parameter that reads value from the database Output.db with procedure ReadTable. Also, I have created a procedure AddRecord to add record to the database. I exported the aimms file to aimmspack file and uploaded it on Cloud. But it is not performing the as expected.Could you please help me with this problem? I have attached the model as well. Thank You,Vishwesh Patil

In the context of the AIMMS environment, a library is an AIMMS project that can be included in/added to other AIMMS projects. Each library in AIMMS contains a subset of project files. You can divide a large project into smaller sub-projects, enabling multiple developers to collaborate easily by sharing parts which are relevant to the entire project. Read here how to add a new libary to the current project

There is an original expression:W = xyW, x, y are all variables.Now I want to define a function which relax the product of two variables into two inequations:f(AB)={AB* >= A+cB; AB*<= dA+eB} (A,B are input variables and c,d,e are parameters)After defining the function, I want to write the primal expression to:W = f(xy).So the W can be relaxed into two inequations by AIMMS automatically.Is it possible to achive this purpose in AIMMS? Or I need to do the function manually and input the inequations on my own?

Depending on which solvers are allowed by your AIMMS license, you might have multiple solvers capable of solving a given type of mathematical program (e.g. LP, MIP). In this case, you can instruct AIMMS in a variety of ways which solver should be used to solve a problem of a specific type. Here is explained how to change the default solver

XML vs JSON : When discussing both XML and JSON APIs, we must emphasize that both have the same objective, in specific terms it can be said that both are accomplish the same goal. The motive of their uses clarifies the best method for them. Extensible Markup Language or XML is founded hard to learn while JSON or JavaScript Object Notation is very easy to learn. XML is not that much convenient with API or Application Programming Interface in comparison with JSON .  

We have multiple projects and I’d like to use the same code (that i’m writing) for each project. In this code, ideally, it would write the Project Title to the database, along with some other data. How can I access that Project Title via the aimms code?

Hi,I have a parameter read from a CSV file. The first column contains the index list, and the other three columns contain the data. However, I need to use the second column as a second index to differentiate between each hour after the parameter is loaded. I was wondering how this can be done in AIMMS. Please note that using the second column as an index in the first place when I am reading the the CSV file is not viable due to other constraints. Please see the attached photo for a better understanding of the issue.Thank you. 

Hi, I have a problem with the callback procedure that is called at each iteration but  not the last. At each iteration, the callback is  called, if the solution violates the constraints, the cuts are generated and added to the model, but in the last iteration the callback is not  called at all, so the feasibility is not checked and the optimal solution provided by (cplex or gurobi, I tried both) is  in fact infeasible.  This  is  a scheme of  the  code: GMPRelaxedModel := GMP::Instance::Generate(NoEnergy_per_lazy) ;GMP::Instance::SetCallbackAddLazyConstraint( GMPRelaxedModel, 'Robust_NogoodCut' );GMP::Instance::Solve( GMPRelaxedModel );

Hi Team,Is there any way so that we can auto-schedule our deployed model. For example, In AIMMS Pro, I want to set the app to run automatically every 15 minutes.Regards

I am using SetElementRename to rename one of my elements. However, each time I run the function, it claims that the element is specified in the model and cannot be renamed, but this element is not hard-coded in any part of the model.Has anyone actually got this function to work?

I just created some new colors in the User Colors tool, but once I try to use it on my List Widget icon, it does not recognize.  How can I relate those two things?

We are rebuilding the PRO Jobs Page, see also this post.While working on that another idea came up, replacing the 'filtered list’ of the current Jobs Page with a LLM-powered chat. And we generated a ‘paper prototype’ of this. Can you please take a look and let us know:what pros and what cons do you recognize? would you prefer this over the current ‘filtered list’? suppose we would offer it as an alternative, for what tasks would you use it and for which ones use the ‘filtered list’?Here is the ‘paper prototype’, illustrating various dialogues from various roles.  Each dialogue is designed to address the specific needs of the user role, demonstrating the AI-powered chat's ability to understand context and provide actionable information and solutions. We trust that with that it is self-explanatory.Thanks for your help!Paper Prototype for Jobs Page powered by GenAI Dialogue 1: End User - Checking Task Stat

Sidepanels were released in AIMMS version 4.64.1. If you are using the previously shared application specific resources (ASR) to retain the old theme of WebUI (AIMMS 4.58 and lower), links to the sidepanel pages will be also displayed in the top navigation menu. Here

How can you make a Gantt chart based on a binary variable under page manager?

Solvers can share information about the solution process up to a very detailed level. To avoid overhead in generating information that is not inspected anyway, the AIMMS IDE defaults to not sharing any information. Here

In this How-To article we explain how to implement the usage of the data formats (JSON, XML, CSV, Excel, Parquet) in mapping files and, if applicable, format-specific requirements. This article is part of a How-To series on the DEX. Let us know if you have any questions about using the DEX and/or suggestions for follow-up articles! Go to article: Dealing with different data types in the DEXNew to DEX? Start here! 

Today I got the question: Get elements of a set using set name as a string?This can be achieved using a runtime library.The interface to the data is a procedure with:- input   : the set name- outputs :   o an integer set with the same number of elements  o a string parameter indexed over that integer set with the names of the elements as strings.The tricky part of creating the runtime library is the passing of arguments. Arguments are local identifiers in a procedure, and local identifiers cannot be directly createdusing model editing procedures. This is circumvented by first creating the declaration section, andthen moving that declaration section as a section inside the procedure.An example project which does just that is enclosed.

In our current AIMMS 4.0 release we have introduced a number of fundamental, and sometimes breaking changes in managing the project sources, about which we got a lot of questions. In this article, I will describe these changes and also explain the rationale behind them. Lots to explore here

Hello,  I’m trying to load a Library from repository but I keep getting this error :  Can you please help understand why ? Thank you

I found there is a strange phenomenon that the progress window shows a infeasible problem with optimal status, just like this:So, I want to know the program is infeasible or not and the reason caused this. Besides, the program window shows the best solution is na but I found the objective value in math inspector is non-null.