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Giorgos Nikolakopoulos Explorer

Infeasible Solution in my Thesis model

Hello, trying to solve my Thesis Model there has been message about infeasible solution. ''Warning: After zero iterations CPLEX 12.8 concluded that an integer solution to MeanCostPlan4 does not exist.'' the model is about my thesis, so i would appreciate some help. i attach a zipped file(Fdata1 is...

Supply Chain
87 5
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4 days ago
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peddy3009 Explorer

limit a sum
Solved

Hello, my model has the following constraint: s(i,j)*x(j)+sum((m,t_), MW(i,j,m,t_)*y(j,m,t_))+sum((k,t_),MWK(i,j,k,t_))+dM(i,j,t)-dP(i,j,t)=B(i,t) The index domain is: (i,j,t) I want the system to accumulate all MWK(i,j,k,t_) respectively all MW(i,j,m,t_)*y(j,m,t_) from t_0 until t_=t and then t...

Developers (Math, OR, programming)
40 2
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5 days ago
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AnkitBhagat Newcomer

Disable some of Constraints in Model through a user interface
Solved

Hi All, I want to create a user interface or page where i can control some of the constraints to toggle and run the model. e.g. Lets say we have 10 set of constraints and I want to run the model with 8 currently while rest 2 I want to disable for the run. This needs to be dynamic Is there any doc...

Developers (Math, OR, programming)
25 1
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Rank
10 days ago
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Rachel Explorer

Implementing a 4-4-5 monthly calendar
Solved

I would like to implement a modified monthly calendar, where rather than each month being a strict calendar month, I use the 4 week, 4 week, 5 week pattern. Has anyone used this previously, and if so do have any tips to share? Thanks Rachel

Developers (Math, OR, programming)
33 2
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11 days ago
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Katja Newcomer

Delete a project
Solved

Hi, I am using AIMMS for my bachelorthesis. How can I delete a project from "projects"? Thankyou

Developers (Math, OR, programming)
34 1
Rank
12 days ago
luiswilbert Explorer

How machine learning and optimization can be applied to Omnichannel Retailing?

Today, the challenge for the companies is providing consistent, yet unique and contextual brand experiences across multiple customer-aware touchpoints, including brick and mortar, marketplaces, web, mobile and social. In response to these new customer preferences, the Omnichannel Strategy has been c...

Supply Chain
88 2
18 days ago
J
JWand Newcomer

Save Upper and Lower Bounds from Baron
Question

Dear Ladies and Gentleman, I use the solver Baron for a NLP and solve several problems with an if function in the Main Execution. After a specific time limit is exceeded, I want to save the Upper and Lower Bounds in a file or even better in a Parameter. Is this possible? Best regards, Jacqueline...

Developers (Math, OR, programming)
44 2
Rank
30 days ago
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Rank
Gloria Quintanilla Administrator

News Supply Chain Digest - July 2019

Every month, we send out an email digest with our latest supply chain content. If you're not signed up to receive it in your inbox, you now have the chance to read the trending topics in our Online Community! We will start posting them here on a monthly basis. What's new in July? Assess your Deman...

Supply Chain
33 0
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Rank
1 month ago
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Scott Bury Newcomer

Working with external databases

Hello. Is anyone out there working with OPC UA or other OPC protocols with AIMMS applications? If so I'd like to talk with you. Scott Bury

Deployment, Cloud, Servers
26 0
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1 month ago
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Patrick Administrator

StackExchange got an Operations Research corner

StackExchange got an Operations Research corner now. https://or.stackexchange.com/

Developers (Math, OR, programming)
17 0
Rank
2 months ago
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sadofly Explorer

Bilinear terms in equality constraints (non-convex MIQCP) xy=z?

Hi, I have a non convex MIQCP problem, where the non convexity is illustrated in bilinear constrains like : x+yz=u where x,y,z,u are continuous variables, a general form of this topic is modeling or approaching the constraint : "xy=z" neither gurobi or cplex can handle it. I m wondering, should i...

Developers (Math, OR, programming)
82 4
Rank
2 months ago
C
Chibo Supporter

Simple constraint makes the model infeasible

Dear Staff, I am experiencing a weird behaviour within one of my models implemented in AIMMS. I have a simple flow model. Among others, there are the following variables: F, continous variable X, continuous variable The variables do not have lower or upper bounds, so they are free. Then there are s...

Developers (Math, OR, programming)
34 2
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2 months ago
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Chibo Supporter

Modelling question
Solved

Dear Staff, I would like your tips for an if-then constraint. In particular, I have the following variables: R, binary variable P, continuous variable Y, continuous variable I have the following parameters: A B The constraints I would like to write are the following: 1) if R=1 then P = A*Y 2) if...

Developers (Math, OR, programming)
107 2
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2 months ago
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Jess Es Community Manager

Blog Integer and Linear Modeling Tricks

Integer and Linear Modeling Tricks

Here's a post sourced from the old Tech Blog that points you to some handy tricks for integer and linear modeling! Modeling problems with an (integer) linear program sometimes requires some experience to recognize certain structures in the problem description that can be formulated in a linear way....

Developers (Math, OR, programming)
32 0
Rank
2 months ago
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pamjsnn Enthusiast

How to code Summation of (inverted A)(w)-element of-W in constraints?
Solved

Hi! We were able to execute the model already but we're having warnings that the result for this column is similar with the other column. Take for example the constraints 22 and 26? How do we code the "summation"? Sorry I'm just a beginner and I have no one to teach me and I only have a month to stu...

Developers (Math, OR, programming)
50 3
2 months ago
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pamjsnn Enthusiast

Subtraction of Element Valued Expressions
Solved

Hi! I have a constraint (shown at the photo below) wherein two sets need to be subtracted. I tried introducing another set Kw with a definition of k-Ks but it says subtraction of element valued expressions require the set range to be equal, but the ranges domain set "Subblock" and set "Candidate_Sub...

Developers (Math, OR, programming)
87 9
2 months ago
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Arthur Administrator

How Machine Learning can help Optimization modeling

Dear AIMMS communians😉, We started some years ago at AIMMS an investigation on how machine learning and optimization can work together, or how machine learning algorithms could help optimization modeling. During the AIMMS Summit, in addition to the very interesting presentation from Ger Kool...

Developers (Math, OR, programming)
301 0
Rank
2 months ago
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pamjsnn Enthusiast

Objective Function Problem:
Solved

Hi, the "objective function" of my program is read as a variable in AIMMS. All the parameters in the objective function already have a data read from excel. My problem is, AIMMS keeps on saying "the scope of index i has not been specified" when I try to specify the index, the program won't run becau...

Developers (Math, OR, programming)
94 3
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2 months ago
jankranendonk Newcomer

3 tips for a better page layout

Hi all, we like to share three insights that help to create better page layouts, in order to create more user friendly apps. Any thoughts? Pls share in the comments. Tip 1: Tell a story on your page, by matching the placement of widgets to your user's ideal flow. Next, order your widgets from top l...

UI and UX
136 0
2 months ago
M
Marten Newcomer

Creating Confidence Intervals
Solved

Hi all, For our program, we have a 3*36 parameter input that we want to vary using a normal distribution for 1000 times in order to save the objective values to, eventually, create confidence intervals. We have the 1000 variation matrices, but we do not know manage to load these into AIMMS and let...

Developers (Math, OR, programming)
102 1
Rank
3 months ago
Rank
Jess Es Community Manager

Modeling the forest

This interview, originally published in 2014, comes from our Tech Blog archives. Strategic Forest Management Model (SFMM) was among the first applications of AIMMS and is still going strong. Please note, some cited data is a bit dated, but we think that the story is still worth sharing. Ontario’s...

Developers (Math, OR, programming)
44 0
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3 months ago
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Jess Es Community Manager

Using operations research to solve pressing global issues

This article, originally published in 2013, comes from our Tech Blog archives. As such, some cited data is a bit dated, but we think that the story's value illustrating practical application of OR still holds up. The mathematical story behind North Star Alliance’s POLARIS More than 35 million peop...

Developers (Math, OR, programming)
15 0
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3 months ago
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Kim AIMMSian

Blog S&OP – 13 Years On, What Have We Learned and What Has Changed?

S&OP – 13 Years On, What Have We Learned and What Has Changed?

In this new blog post @Brian Dooley reflects on an old article about S&OP he wrote in 2006. Blog post: S&OP – 13 Years On, What Have We Learned and What Has Changed? What do you think has changed?

Supply Chain
16 0
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3 months ago
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Kim AIMMSian

Blog Digital Representation and our Obsession with Optimization

Digital Representation and our Obsession with Optimization

What is a Digital Representation of your Supply Chain and why is it important? Our very own Chris Gordon (@ChrisG )explains. Blog Post: Digital Representation and our Obsession with Optimization Let us know what you think? Is a digital representation of your supply chain an important opportunity...

Supply Chain
21 0
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3 months ago
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User Support Administrator

ERP 101: Choosing the right solution for the business

AIMMS' Brian Dooley was recently featured on CIO Dive. Read the article and get tips on selecting and implementing an ERP system that works for your business

Supply Chain
16 0
Rank
4 months ago

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