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Optimization for and with Machine Learning (OPTIMAL)

We are currently exploring opportunities for combining Optimization and Machine Learning through collaboration with the OPTIMAL consortium which carries out a large research project entitled "Optimization for and with Machine Learning".The goal of this project is to provide new analysis and tools fo...

Developers (Math, OR, programming)

Standardize link to latest version

Hi all,Every time we update our app, I get e-mails from users that they cannot enter the app and they send me a picture like the one below. We have tried to prevent this from happening by using the ‘latest’ tag option. All links in our information channels link to our app ending with the ‘/tag/lates...

Developers (Math, OR, programming)

Article OptiCL: A Python Package for Mixed-Integer Optimization with Constraint Learning

Herewith we would like provide some information on behalf of our partners from the OPTIMAL project introduced in one of our previous posts. More specifically, this post is about the OptiCL package developed by the researchers at OPTIMAL for Mixed-Integer Optimization with Constraint Learning. At AIM...

Developers (Math, OR, programming)

Article How the AIMMS SC app developers use automated testing

Recently I spoke about automated testing with my colleagues who are developing our off-the-shelf supply chain apps.How and how often do you run the automated tests?Each time we commit AIMMS code to our code repository in Gitlab, an automated pipelineruns our entire test collection. Around 15 minutes...

Developers (Math, OR, programming)

Article Using Machine Learning in AIMMS for better Decision Making

Why this articleIn this article, we will explain how Machine Learning and AIMMS can work together to complement the mathematical modeling and optimization capabilities of AIMMS as decision support technology. Why? Because we see an increasing need by our customers to understand its potential. Also,...

Developers (Math, OR, programming)

sorting a multiple dimensional array by values with in it

Hi Aimms Community, I’m having trouble using the Sort function in order to obtain the values of a mulit-dimensional array: For example:multi-dimensional array = foo(size,car,color,location) size, car, color, location = some float value [ ‘small’, ‘toyota’, ‘white’, ‘usa’] = 1.25 [ ‘smal...

Developers (Math, OR, programming)

Unit Commitment

Hello everyone,I am new to AIMMS, I am trying to solve a unit commitment problem with four thermal generator units and a PV unit. I have added the four generators in a set with index (u) with all their parameters in the model. Now, I want to add another source of power supply which is PV as a fixed...

Developers (Math, OR, programming)

Applying AIMMS Community Edition for fire ponds and access routes layout optimisation

We solved the MIP optimization model. The characteristics of the models and solution times are given in the table below. We used SQLServer Express for data ETL purposes. Input and output data published in two datasets (Dataset: Podporozhye, Dataset: Estonia) in the MendeleyData repository. We will p...

Developers (Math, OR, programming)

Using a parameter as index (nested indexes)

Hi all,I’m sorry of the question is too basic, but I recently had to re-run an old code (originally developed in AIMMS 4.47) and I’m having lots of trouble correcting errors.I have a variable ( Ireal(ld) ) that uses another variable ( Vreal(bus,ph) ) in its calculation.I have an string parameter ( l...

Developers (Math, OR, programming)

Lauching AIMMS through AIMMSSelector with cloud licensing

Hi all,I'm a researcher and I use AIMMS with an Academic License.AIMMS is part of a routine I developed in Python and I used the "AIMMSSelector" to launch AIMMS, but since my license is now a cloud license I've not been able to launch AIMMS that way, it does not recognize the license, and only give...

Developers (Math, OR, programming)

Article Prof. Edwin Zondervan on The Shift Towards Sustainability in Process Systems Engineering

We have had the pleasure of interviewing many academics about their use of AIMMS. Often, they are working on innovative research projects that will shape the future of our economy for years to come. Edwin Zondervan is one of them. Edwin is a professor of process systems engineering at Twente Univers...

Developers (Math, OR, programming)

Article Help us test a new tool to automatically generate AIMMS code

Hi, Community members, I'm excited to share a new online tool that has been developed by Dowon Lee, a graduate student in Industrial & Systems Engineering at the Univ. at Buffalo, with the generous support of AIMMS. tex2solver generates AIMMS code from LaTeX, or even pictures of an optimization...

Developers (Math, OR, programming)

Article Prof. Chiara Bordin Offers An Insider’s Look into the Field of Energy Informatics

AIMMS has long been in the toolbox of energy modelers. With the field undergoing a lot of change today, we were curious to hear from someone who is at the forefront of both energy modeling and one of the biggest challenges of our time: a transition to low-carbon energy systems. We had the pleasure o...

Developers (Math, OR, programming)

Part of a summation

Hello,Since I'm new to aims, I have (I think) a simple question;How can I do a part of a summation?So for example; I've got x1, x2, x3, x4 and x5 as my sets. In my mathematical model is one constraint: x5 = 10*x1 + 18*x2. How do I get this in AIMMS?

Developers (Math, OR, programming)

Article An AIMMS-based Toolkit for The Optimal Control of Today’s Complex Grids: A conversation with Prof. Nnamdi Nwulu and Dr. Saheed Lekan Gbadamosi (University of Johannesburg)

AIMMS has always had a tight relationship with academia, so we love to highlight professors, students and researchers who are using our software to solve problems around the world. Recently, we had the pleasure of speaking with Prof. Nnamdi Nwulu from the University of Johannesburg. Nnamdi recently...

Developers (Math, OR, programming)

Integrated Electricity, Hydrogen and Gas Markets Modelling in AIMMS

Integrated Electricity, Hydrogen and Gas Markets Model (I-ELGAS) The future energy system will be increasingly integrated in order to absorb large fluctuations in intermittent renewables. Electricity, gas and hydrogen markets are interlinked via technologies such as water-electrolysis plants, natu...

Developers (Math, OR, programming)

Article Contribution to the Handbook of Smart Energy Systems

Dear Colleague, I warmly invite you to contribute to the Handbook of Smart Energy Systems project https://meteor.springer.com/hses. Considering the importance of energy production, transmission, and distribution systems on the current and future of human living, to adjust to the new normal life of p...

Developers (Math, OR, programming)

How to build a crossroad/ 2 ways

Hi,I want to build a model that can transport stuff from (i to j) directly or by stopping over at facility r.The transportcost (i to r) and (r to j) are cheaper than the direct transport (i to j). Problems:Open(r ) is either 0 or all possible r are opened and the amount is divided up evenlyEven if t...

Supply Chain

Share your favorite OR Blogs

Good afternoon!I would like to invite the community to share their favorite blogs on mathematical programming, operations research, and data manipulation.My favorite blog is http://yetanothermathprogrammingconsultant.blogspot.com/The author of the blog uses GAMS. Models created in GAMS can be conver...

Developers (Math, OR, programming)

How to write Floor or ceiling Function?

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?

Developers (Math, OR, programming)

Not getting correct results for leading times, phasing in capital and life of plant

The data for leading times, phasing in capital and life of plant was imported to the model. A new declaration called Lead times was added. It looks like this: All the identifiers in the Lead Times declaration are supposed to take care of the leading times, phasing in capital and economic life. Howev...

Developers (Math, OR, programming)

Error when importing percentage data from Excel to an AIMMS model

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...

Developers (Math, OR, programming)

Article Improve Solve Times for your AIMMS Models with ODH-CPLEX

ODH-CPLEX is a high performance solver for Mixed Integer Programming (MIP) and Mixed Integer Quadratic Programming (MIQP/MIQCP) problems. ODH-CPLEX uses the CPLEX solver underneath and is made to run on modern multiprocessor machines. While it is designed for scheduling problems, it’s been deployed...

Developers (Math, OR, programming)

Stop in the middle of run

Hi, My model took more than 14 days to run on i7 core computer with 16GB RAM. And it still does not give an optimal solution yet. What will happen if we stop AIMMS during the middle of running a model when the solution is not optimal yet? The gap in progress window shows 38.2% for 10 days (see attac...

Developers (Math, OR, programming)

Adding leading time, phasing in capital and economic life to a generation capacity expansion planning model

Good day, I have an electricity capacity expansion planning model which was developed in AIMMS and is working fine. However, now I need to add the following:Lead times, which differ for each technology. Currently, the model assumes that if a technology is selected by the model, it can produce electr...

Developers (Math, OR, programming)

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