Common interests

pedronamoradorosa Explorer

Transportation-Distribution problem of paints - Constraint Set

Solved

Hey, I have this Transportation-Distribution problem of paints and it says that in the 10th day the stock of paint of each color and each type has to be 1000L. I created a constraint: FinalStockConstraint Index domain: (d,c,t) 'd - day; c - color; t - type' Definition: sum[ds,DistributionSiteStoc...

Supply Chain

0 43 2

P

4 days ago

T

tobi Explorer

Risk-sensitive planning support for forest enterprises: The YAFO model

Yafo was developed at the Institute of Forest Management (Technical University of Munich) and is continuously driven further to challenge new research questions. We appreciate the free educational version of Aimms to be up-to-date with the newest modelling techniques. So far YAFO enabled new insig...

Developers (Math, OR, programming)

3 39 1

17 days ago

G

Gloria Quintanilla Administrator

News Supply Chain Digest - September 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! Here is an overview of the content we published in September. How do supply chain professi...

Supply Chain

0 8 0

G

21 days ago

G

Gloria Quintanilla Administrator

News Supply Chain Digest - August 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! Here are the trending topics for August. Could self-organization make your supply chain mor...

Supply Chain

0 8 0

G

21 days ago

M

Melike Enthusiast

Errors with operators

Solved

I tried to multiply a set to a variable in my constraint, which gave the error There is no operation defined for operator "*" with the arguments of data type numeric and data type set. I need to find a solution to avoid this multiplication but come to the same result. sum[j,Stationen*Zuordnung_Auf...

Developers (Math, OR, programming)

0 120 12

M

26 days ago

M

Muhammad Furqan

Multi-depot VRP

Solved

Hello Team, I am working on the multidepot-VRP problem an extension of your practical example capacitated VRP. I want to make a model in which vehicles will depart from their depots to serve different customers and turn back to the same depot where it started from. I made a rough model but facing so...

Supply Chain

0 308 16

M

27 days ago

G

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

0 124 5

1 month ago

P

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)

0 56 2

P

1 month ago

A

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)

0 39 1

2 months ago

R

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)

0 36 2

R

2 months ago

K

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)

0 46 1

2 months 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

2 104 2

2 months 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)

0 73 2

2 months ago

G

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

1 49 0

G

2 months ago

S

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

0 39 0

S

2 months ago

Patrick Administrator

StackExchange got an Operations Research corner

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

Developers (Math, OR, programming)

1 19 0

3 months ago

S

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)

1 101 4

4 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)

0 37 2

C

4 months ago

C

Chibo Supporter

Modelling question - if then constraint

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)

1 132 2

C

4 months ago

Jess Es Community Manager

Blog 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)

0 37 0

4 months ago

P

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)

0 51 3

4 months ago

P

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)

0 95 9

4 months ago

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)

5 340 0

4 months ago

P

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)

1 163 3

P

4 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

12 173 0

4 months ago

News Supply Chain Digest - September 2019

News Supply Chain Digest - August 2019

News Supply Chain Digest - July 2019

Blog Integer and Linear Modeling Tricks

Sign up

Login to the community

Scanning file for viruses.

This file cannot be downloaded