Optimization Tooling

Hi all,I have implemented a custom widget to create piecharts with a different formatting than the standard aimms widget. This new widget is based on v7 of D3.The workflow is the same as referenced here: https://documentation.aimms.com/webui/dev-tut-4.htmlI included some html script that loads D3 v7 and it should load D3 v3 (=standard in aimms) straight after the charts are generated. What happens now is the following:Opening page with piecharts: renders perfectly Opening a page with charts depending on v3: does not load Reloading the webpage: loads the v3 charts againThere is something wrong here with versioning,  but I am not sure why. Documents:Log1: Console log of step 1 Log2: Step 2; opening a page with a gantt chart Log3: step3; refreshing the whole page Code that generates the piecharts Factory that initialises the different custom widgetsI would love to know if anyone has similar experiences and how they resolved it.Thanks in advance! 

Hi,I want to be able to write some specific messages into AIMMS Pro Session Log file from inside AIMMS.How can I do that?Best,Gorkem

Frequently we run into the limitations of resizing widget. Here is one concrete example which could be solved if we can hide the table header.   In our application we have a table with a 1-dimensional parameter with 4 items. With a table widget of row height 1, we don't see the last item unless we scroll. With a table widget of row height 2, we have a lot of redundant white space we want to use for something else. All items would be visible in the smaller widget, if we could hide /collapse the header. Is there is a way we can remove the column headers via CSS?   As a side note, I believe grid we are limited to when placing widgets is too coarse.

Are there any list of all methods exposed by aimmspy package. From the description available on AIMMS website, i can only see few exposed methods: get_model, data, assign, update.

AIMMS Applications deployed on AIMMS Cloud are designed to be End-User friendly. Still incidents may occur, and then it is useful to have logging information available such that post mortem analysis can go quickly to the cause of the incident at hand. Suggested project option settings:Option 1: communicate_warnings_to_end_usersWarnings can provide useful information, typically to developers of the application and to maintainers of the data sources (warnings on inconsistency of the data). However, not all end-users are familiar with the design of the application at hand, and may therefor be unnecessarily rattled by these messages.For the above reasons, the default of the option communicate_warnings_to_end_users is off.However, best practice is to turn these warnings on, provided there is error handling in the application, such that warnings are logged and handled, but not shown to end-users. Option 2: major_messages and time_messages:A typical item in log files people look for first is

Hi,Here is the set that I have and is a subset of AllVariables with the index i_DistWeightVar. Note that the variables in this set have exactly the same indices and in the same order, (i.e., i_period, i_Terminal, i_Source, i_Product, i_Fleet, i_Zone, i_Customer).Here is the parameter that I create that only differs with his first index than the variables in the set above.I am hoping to be able to make assignments by using a function like StringToVariable given below:Anything you can give me to use on the RHS of this assignment?Best,Gorkem

Dear AIMMS Community,As part of our ongoing commitment to enhancing the AIMMS WebUI, we are preparing a comprehensive overhaul of the Gantt Chart widget. This redesign aims to enhance its capabilities, performance, and usability to better support a wide range of planning and scheduling scenarios.We would greatly appreciate your input and suggestions to help guide this effort.We are particularly interested in hearing your thoughts on: Desired features or capabilities Usability improvements Performance expectations (especially with large datasets) Styling and customization options Support for specific use cases in your apps Or even something entirely new... Please note that several ideas already submitted in the Ideation section have been reviewed and taken into consideration during the initial scoping of this redesign. We appreciate the contributions made thus far. We now invite further input to ensure a more comprehensive understanding of user needs and use cases.📩 Please le

I’d like to thank the great support we received from the AIMMS team and specifically ​@Chris Kuip!For our joint customer DHL Benelux we’ve build an AIMMS tool. Some details on the case:DHL annually ships over 100 million parcels from A to B. These millions of parcels go through 3 stages:First mile: collect the parcel at A and bring it to a sorting center/hub Linehaul transport: bring the parcel from the first sorting center to its destination sorting center (this transport is sometimes called the network) Last mile: deliver the parcel from the destination sorting center to BOur AIMMS based tactical planning optimization tool enables step 2, the network planning: it can automatically create an optimized linehaul planning, considering available resources, crossdocking, sorting curves, special pickups, round trips, one ways, driver breaks and more. One necessary step in the algorithm is to generate new routes. This is in essence a breadth first search variant, and it was the slowest step

Here I found the function GMP::Instance::SetMathematicalProgrammingType is not able to change mathematical type of a instance from MIP to QP. Is there any way to achieve this without generate the instance again?

As members of the Data Science Team at Sainsburys, we were facing a very large scale assortment/ inventory problem. We would like to thank the AIMMS OT User Support team for its help and its terrific job leading to a dramatical reduction of the time needed for the model generation!Thank you!

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……..") my_aimms : Model = project.get_model(__file__) my_aimms.GuiReadData() After running the script (with proper paths and license), I get Unable to load IBM CPLEX library. Exiting.I tried to change the solver within AIMMS but still the same error occurs.  Is there anyone that encountered the same issue? I look forward to a reply.Kind regards,Jesper 

Dear all,Is there a probability function in AIMMS?For example, I want to calculate:where:x: The capacity of power plant to be constructed (MW)y: Installed capacity of power plantF: force outage rate of power plant Thank you very much…. 

Hi, Let’s say I have a set consisting of 5 elements such that: Set1 = {‘A’,‘B’,‘C’,‘D’,‘E’}.How can I move some elements to the end of the set. For example:Set1 = {‘A’, ‘D’,’E’,’B’,’C’} Thanks!

Our users want to be able to store case files locally on their computer and reupload to the cloud environment at a later stage. It looks like the WebUI data manager does not support this requirement. What is the best way to enable users with such a feature?

Resolved!Thank you!

Hi,I am wondering whether it is possible to read the Jobs screen data from the PRO server into an AIMMS project. I am especially interested in the Process ID but would like to read all the information if possible. See below.Best,Gorkem

Hi everyone,On June 11, AIMMS hosted the webinar "Why So Slow?" — a session all about understanding and improving model performance.A big thank you to everyone who joined!It was wonderful to see (and recognize!) so many familiar names from across AIMMS, our clients, and partners. It's always a great reminder of how connected and collaborative our community is.We hope you found the session both insightful and enjoyable — even if we got a little deep into the technical weeds at times. 😅As promised, 📎 slides are attached to this topicIf you have any follow-up questions or thoughts, feel free to post them here. We’d love to keep the conversation going!And if you couldn’t make it — no worries.The recording is available, and even some of our most experienced users told us they picked up a few new insights.▶️ You can view the recording here

Can anyone tell me if there is a way to write profiler output to a file?     An external application is invoking AIMMS from the command line multiple times during its run, so it would be useful to generate this file 

Dear Community,I wanted to share an example for which you can monitor if the user has been idle in AIMMS for a certain period.Why?You may want to check if your users are not leaving applications open while not using it for long periods , effectively occupying user licenses and compute power while blocking other users.There already is a timeout for WebUI applications, but this only happens if the browser tab is closed, is made idle by the browser, or the connection is lost - hence, if the user opens the app but simply forgets it open, it will not be automatically ended.How?To do this, I have two simple procedures:Procedure pr_checkIdle { Body: { if DataChangeMonitorHasChanged("idle_monitor") then sp_log += CurrentToString("%c%y-%m-%d %H:%M:%S") + " DataChangeMonitorHasChanged detected change\n"; DataChangeMonitorReset("idle_monitor",s_identifierToMonitor); empty p_howLongIdle; else sp_log += CurrentToString("%c%y-%m-%d %H:%M:%S") + " DataChangeMonitorHasChanged no

Pages in Library (PiL) is a powerful new feature designed to boost productivity, enable collaborative development, and promote the reuse of your best AIMMS WebUI designs across projects.What Is Pages in Library?Traditionally, WebUI pages are tightly bound to individual projects. Pages in Library changes that by allowing you to create and store interface pages within a library—independent of any specific project. This means you can build polished, functional interfaces once and reuse them across multiple applications. Better yet, since these pages are decoupled from the main project, any updates to the library can be propagated across all projects using it, dramatically simplifying maintenance and upgrades.When Is It Available and How Does It Work?Here is a link to the documentation.Why Does It Matter for Developers?This feature marks a significant leap in development efficiency. Imagine building a reusable scenario manager or interface templates complete with tables, CRUD operations, f

Hello everyone,This is my first time using AIMMS for academic purpose. I was facing an issue with the WebUI the is not downloaded correctly, then i found a post here in the community suggested to download this https://library-repository.aimms.com:443/libs/69378F70-E906-486F-8F2C-1D606AEB9669/24.11.2.3/x64_vc143_Release.alib in MS Edge browser. After i downloaded it, then a new error shows with following error message:"Failed to retrieve the latest WebUI version from the repository(Error: Error resolving hostname library-repository.aimms.com: No such host is known.)"Does anyone face this issue, what should i do in this case?Thanks!

Hi everybody,  Recently I updated AIMMS to version 24.6.1.6. Now I get the error message “The element 'abort' is not in the set "AllIdentifiers", see also the option warning_explicit_element_not_in_set.”. Does anyone know how I can solve this error?  It happens when I use a call back function and want to assign “abort” to the CallBackReturnStatus.  Thank you in advance!

I'm modeling a yearly constraint that enforces [total supply from sector X]  ≥ 50% of [demand]. I want insight into the marginal monthly contributions to this constraint, so I introduced monthly constraints with a variable equal to total monthly supply in sector X and rewrote the yearly constraint as a sum over these. The idea is that if I take the shadow price of this monthly constraint, it should tell me how much the objective value changes when changing the RHS of each equation, namely the supply in sector X. Or: ‘how much does it cost to add one more unit of supply from sector X’? However, the shadow prices for all months are identical, despite clear monthly variation in supply economics. Does anyone know why the model could not be reflecting these differences in marginal values? The model set up in pseudocode:Objective function: minimize Sum(all sectors, marginal costs * supply per sector)                      *also including storage and transport costsMonthly constraint: sum(all