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22
G
gorkemAce
 AIMMS Language
How to Map String Name to AIMMS Variable in a Procedure similar to globals()["x"] in Python

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

812
luispinto
AIMMSian
Madhu Krishnappa
AIMMSian
Madhu KrishnappaAIMMSian
 WebUI
Seeking Community Input on the Gantt Chart Widget Overhaul

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

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S
J
JGOptExplorer
 
Able to build model from python interfaceDiscussion ongoing

Is there any proposal or plan to extend the functionality of aimmspy so that we can build the entire model directly from Python, similar to a solver’s native Python interface?At present, the interface seems to only provide functionality to interact with an existing model — such as updating or assigning data and running procedures. For example, I am currently unable to add a new variable or parameter from the Python interface.However, it would be extremely useful if the interface were extended to support full model creation in Python. This would provide greater control over the model and help bring more structure to the development process.

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232
Jan-Willem
AIMMSian
J
JGOptExplorer
 Integrations and Data Exchange
List of exposed methods through aimmspy

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.

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F
AIMMSian
S
AIMMS Partner
stijndAIMMS Partner
 AIMMS Language
Impressive AIMMS performance improvements!

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

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S
AIMMS Partner
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Augustine KwwonExplorer
 
log and message clearing function in REST API serviceDiscussion ongoing

As a user of AIMMS applications in a large scale federated energy modeling framework, using AIMMS as endpoint, hundreds of times a night,I would like to manage the logging of AIMMS errors or messages on a per-request basis by clearing errors and messages in the beginning of each request so that a relevent copy of .err and log files produced during a API task can be saved with a particular request.The value of this user story is easier management of persisted logging information,including what logging can be safely cleared, and only relevant information gathering on particular API tasks warrant a root cause analysis can be collected. 

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192
MarcelRoelofs
AIMMSian
D
denghaiyingEnthusiast
 Algorithmic Capabilities & Optimization Modeling
How to change the mathematical type of a instance？

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?

151
Marcel Hunting
AIMMSian
Wanie Saidi
Wanie SaidiEnthusiast
 Research & AIMMS Questions
Best LP Bound & Best Solution

Hello,I am currently working on solving a University Examination Timetabling Problem (UETP) using the Binary Integer Programming (BIP) method in AIMMS. My model includes two soft constraints, where preference values are restricted to integers from 1 to 5 (i.e., 5, 4, 3, 2, 1).After running the model in AIMMS, I obtained the following results: Best LP Bound: 4080.487042 Best Solution: 4041 Gap: 0.98% From my understanding: The Best LP Bound represents the theoretical lower bound from the linear relaxation of the integer program. The Best Solution is the best feasible (integer) solution found so far. When the Gap reaches 0%, the Best Solution should equal the Best LP Bound. My question is:Since I am solving a binary integer problem, how is it possible that when the gap reaches 0%, the Best Solution appears as a decimal value (e.g., 4080.487042)? Shouldn’t the solution remain strictly integer (since it’s binary), and therefore the objective value also be an integer? Any clarificat

302
Wanie Saidi
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luigi.bobbioExplorer
 Algorithmic Capabilities & Optimization Modeling
Execution Efficiency Support

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!

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L
Jan-Willem
AIMMSian
Jan-WillemAIMMSian
Python Bridge released: two libraries to combine the best of Python and of AIMMS.

We have now released supported, documented versions of two libraries bridging the worlds of Python and AIMMS.These will allow you to benefit from (a) the ubiquity of the Python language and its vast library collection and (b) from the proven AIMMS functionality for supporting industrial optimization models.aimmspy This library supports ‘Python in the lead’ scenarios. A Python application interacts directly with an in process AIMMS model for manipulation of the AIMMS data and running optimizations. Primary use case for this is probably running AIMMS models ‘headless', for example as part of a larger application, in automated pipelines or for large-scale batch optimizations.   Key features:Interact with an AIMMS run-time from inside your Python script Read and write AIMMS identifier values Run procedures in AIMMS including solves Support for pandas and polars data frames Model declaration using AIMMS Developer Requires a valid AIMMS Developer licenseLearn more from our documentation or r

510
Jan-Willem
AIMMSian
Jan-Willem
AIMMSian
Jan-WillemAIMMSian
Cloud session logs now available from the PRO portal for self-service analysis and trouble-shooting

You can now download cloud session logs from the PRO Portal, so that you can analyze or troubleshoot your sessions. You can access the logs via the Sessions tab and the three vertical dots on the right-hand side. Please note the ‘download log’ option in the top-right-hand corner of the following screen shot.  

180
Jan-Willem
AIMMSian
sandervlot
AIMMS Partner
sandervlotAIMMS Partner
 
Add security measures to Azure Data Lake StorageOn Backlog

Hi, With the new Azure Data Lake Storage being available to AIMMS Cloud users, it will be used more and more for storing and exchanging (sensitive) business data. It would be nice to have some more control over who can access the ADLS. Concepts like IP whitelisting would be very nice (or maybe even a must) to have. Could you consider adding that? Microsoft has a documentation page available with their recommendations: https://learn.microsoft.com/en-us/azure/storage/blobs/security-recommendations.  Best regards,Sander

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547
Jan-Willem
AIMMSian
sandervlot
AIMMS Partner
sandervlotAIMMS Partner
 
Provide proper place to store secrets & configurationOn Backlog

Hi, there are quite some environment-dependent configurations and secrets (database passwords, API keys) that are required for running AIMMS apps. Currently, I see modelers:Storing those secrets unencrypted in the AIMMS Central Storage. This is obviously not very secure.   Including those secrets in their AIMMSpack. This has the downside that you need to create separate AIMMSpacks for test & production environments, which I would consider a bad practice. Furthermore, in this situation you cannot create an AIMMSpack based on your git repo: you also need files outside of that repo (since secrets shouldn't be in git). This is risky and might (at some point) also hinder CI/CD practices.It would be nice to have a proper way to store secrets and configurations. For example, with Azure Key Vault (or something similar).

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Jan-Willem
AIMMSian
M
m.dwiantoExplorer
 
Delete widget from page tabImplemented

Sometimes we need to delete widget. But it is only possible from “App” tab, not from “Page” tab. While in “App” we cannot see which one is unassigned. Good to have option to delete widget from “Page” tab. Or maybe just give marks in App tab to identify which widgets are not used. 

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164
gabiservidone
Administrator
I
iekeschraderExplorer
 Research & AIMMS Questions
Troubles with asynchronous solve and Gurobi solver on VM

Hi, I have constructed a MILP with the size of:______________________________________________________________CPU model: Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz, instruction set [SSE2|AVX|AVX2|AVX512]Thread count: 24 physical cores, 48 logical processors, using up to 48 threadsOptimize a model with 1081904 rows, 968127 columns and 12886704 nonzeros_______________________________________________________________I am using an older version of AIMMS: 4.92.12. I am using the GMP library to generate and solve my instances.I solved 10 instances with each 4*5=20 different parameter settings (so 200 solver sessions in total). My procedures are set up as follows (simplified version): Import instances → Generate 4*5 =20 versions of each instance → start asynchronous execution of 20 instances → WaitforSingleCompletion → Save individual instance data. I use a virtual machine with 24 cores and 48 threads. I use Gurobi as a solver and have a WLS licence for 200 parallel solver sessions. The thre

241
Marcel Hunting
AIMMSian
M
mdlapitanEnthusiast
 Research & AIMMS Questions
Index Domain and Summation Problem

I have a transshipment problem case where in the demand nodes (end terminal) may also transfer to other demand nodes. I have modeled the balance constraint as follows:   Currently, the problem is that the third element of the left-hand side is the inflow to the demand node from other nodes (note that l and o are both demand node indices, just modeled separately to model the movement of goods from demand to demand node). The problem lies here as I need to sum over l given that the constraint must apply for all values of l. The first element of the right-hand side is the outflow from the demand node (l) going to other demand nodes (p). Here, there is no error as the sum applies for p.  

120
M
J
JesperExplorer
 AIMMS Libraries
aimms.py Error

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 

221
Marcel Hunting
AIMMSian
rahmat
rahmatAce
 AIMMS Language
Probability function in AIMMS

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…. 

383
Marcel Hunting
AIMMSian
F
AIMMSian
FergusHathornAIMMSian
SC Navigator 25.11.1

SC Navigator 25.11.1Date July 28, 2025 New Features A new attribute is added to the Custom Objective sheet: Percentage Based. It enables modeling tariffs, duties, and taxes. Furthermore, two new attributes were introduced on the Transport Cost and Transport Step Cost sheets for Percentage Based Custom Objectives: Value and Rate. The cost calculation for the Percentage Based Custom Objectives will be as follows: Volume * Value * Rate + Volume * Cost per UOM. The Charts tab on the Transport Navigator - Results page has been improved. Now the two top charts can also show the vehicles data (which was previously displayed in the two bottom charts). Furthermore, clicking on a location/period bar in either of the top charts will result in the bottom charts displaying the data for that location/period on a more detailed per hour basis. A new ‘Add Delay’ option in the Period Selector’s right-click menu lets users slow down playback by configuring a custom delay. Transport Navig

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F
AIMMSian
Facundo.Olivero
AIMMSian
Facundo.OliveroAIMMSian
 SC Navigator Best Practices
How to Estimate your Secondary Transport CostTutorial

When modeling your base case scenario in SC Navigator, the easiest way to define transportation cost is by using a per-unit rate (e.g., per kg or case) for each transport mode. This works well when you have reliable historical data.However, challenges arise when simulating new scenarios—like serving customers from different warehouses—because cost data for non-existing lanes is often missing. This tutorial shows how to estimate transportation costs using historical data, giving you a per-unit-per-distance cost for each warehouse. This normalized metric helps model alternative distribution strategies quickly and effectively. 1. Starting Point – Required DataTo begin, gather the following data for each warehouse:Total demand served by the warehouse in a defined historical period. Actual shipment volumes from the warehouse to each customer (Base Case volumes). Total transportation cost incurred by the warehouse during that period.(Note: This cost data should come from your ERP or TMS syst

430
Facundo.Olivero
AIMMSian
B
bestwayyyEnthusiast
 AIMMS Language
moving elements in a set to the end

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!

173
gabiservidone
Administrator
Paulus
AIMMS Partner
PaulusAIMMS Partner
 WebUI
Why is there no download / upload case function in the WebUI data manager

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?

1286
gabiservidone
Administrator
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