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Topics about getting started or leveling up as an AIMMS developer.

  • 664 Topics
  • 1,455 Replies
665 Topics
H
HHHermitExplorer
posted in AIMMS Language
User desktop to cloud database help

Hello, Currently, AIMMS Developer is installed as fat client installed on user's workstations but we would like to move the databased externally so the fat client will connect it to an external cloud provider (IaaS or Paas mode maybe managed by AIMMS).Also, we cannot set up a VPN tunnel for each desktop to reach the external cloud hosted database since it would be impractical and expensive.What services, protocols and port will be necessary to open and secure/reliable solution should we choose to implement ?Thanks in advance !

412
MarcelRoelofs
AIMMSian
R
RwitamJEnthusiast
asked in AIMMS Language
Auto-schedule the deployed AIMMS app

Hi Team,Is there any way so that we can auto-schedule our deployed model. For example, In AIMMS Pro, I want to set the app to run automatically every 15 minutes.Regards

301
Chris Kuip
AIMMSian
V
vixingitEnthusiast
asked in AIMMS Language
Automatically show username

Hello, I want to show a user name automatically for every person that uses my model, for example when Jim opens he aimms project, I want the model to detect it’s Jim and  save it in parameter and show it in page my question is how can we detect user infos when the model is opened ?  Thank you

654
V
R
RwitamJEnthusiast
asked in AIMMS Language
Compare the constraints/ variables written in AIMMS project and constraints in .lp file generated from that AIMMS project

I have an AIMMS project. I have downloaded .lp file from the AIMMS project. Is there any way so that I can compare the the constraints written in .lp file and constraints what I have written inside an AIMMS project.

531
Marcel Hunting
AIMMSian
M
MZwanenburg
asked in AIMMS Language
Use initial MIP start for Gurobi

Hi all,I found the setting to use an intial solution in AIMMS for Gurobi, however, how and where do you efficiently add this initial solution in AIMMS? Can I export an AIMMS output and read it again to use as the intial value? If so, how?  I found this topic, but the link does not work: How to start solving with an initial solution | AIMMS Community

993
Marcel Hunting
AIMMSian
D
djdmlwnsEnthusiast
asked in AIMMS Language
Run SQL query on database with dots in the table name

Hello,I am trying to use database procedure function to extract some data from a HANA view database.Unfortunately, table name has dots (“.”), so it seems like AIMMS cannot parse it for SQL query properly. For example, the table name is something like xx.yy.zz/pp, where you can see some dots between xx, yy, and zz.  Can you help us to figure out proper syntax to write sql query with this type of name?Thank you!  

6391
Mischa
AIMMSian
Jess Es
Jess EsGrand Master
published in AIMMS Language
Friday Demo Impressions (20 Jan 2023)

The Friday Demo Recap is back!Find out what’s cooking in the AIMMS Developer environment, and help us answer a question!This week we’re serving:Auto syntax correction Easier innovation with AIMMS Web serverAuto syntax correctionRichard gave us a peek at a sweet new syntax linter that gives the option to fix some specific syntax errors (one at a time, or all at once) in your model. Because, you know, old habits die hard, and we don’t always follow the rules...while it’s not a fix-all, it can certainly speed up your modeling and help you learn where are your mistakes.Easier innovation with AIMMS Web serverNext, Joris and Tygo presented new changes to the AIMMS web server that allow for easier integration between AIMMS and third party web services and REST services. This should open up possibilities for you to mix and match in the future to suit your particular “tapestry of services”. They demonstrated with a new service, configured in about 30 minutes, which allowed them to bring a class

230
Jess Es
R
RwitamJEnthusiast
asked in AIMMS Language
How to reduce model run time for an MIP problem

Hi Team,I am trying to solve a furnace loading problem. There are 60 items to be loaded over the furnaces. The number of furnaces are 32 where 16 of them are identical in nature and other 16 are identical in nature. I have modeled it as MIP problem with objective of capacity maximization in terms of weights. Model is giving correct answer but I am facing run time issues, due to the exponential complexity model is taking longer time to solve (almost more than 1 hour). Note that I have created virtual location inside the furnaces due to other constraints and I am also using some constraints to break the symmetry part. One way to reduce run time is to run it through loop but I do not want to use the loop. Is there any alternative way I can handle.  

2981
Marcel Hunting
AIMMSian
Z
AIMMS Partner
Zsolt MihályAIMMS Partner
asked in AIMMS Language
What is the easiest way to find out whether a constraint is binding?

Ideally, I need this information while running a procedure. I would like to assign it to a parameter. Is there maybe a constraint suffix that I could use to get this information? I’m thinking about something like this: ParameterValue := Constraint.binding

821
Marcel Hunting
AIMMSian
M
MZwanenburg
asked in AIMMS Language
Subset in given order and not ascending or descending

Hi all, I am modelling production routes per production order in which the production routes provide the sequence of the jobs to follow. I created a subset ProductionRoute(i) that is a subset of all possible jobs. See below a production order i that follows the sequence: SMD → AOI → REW. When implementing this in the subset and when running the model, it will follow the sequence AOI → REW → SMD since operations is stated ascending. Such as below.   Is there a possibility to model in AIMMS that it should follow the production route as stated  in the first figure? Instead of looking to the ascending order of the subset. 

748
Chris Kuip
AIMMSian
O
oomseEnthusiast
asked in AIMMS Language
Save Project from a procedure

Hi all, is there a way to save your project from a procedure (as can be done with cases: https://how-to.aimms.com/Articles/258/258-save-a-case-from-aimms-procedure.html)? If not, is it possible to let AIMMS automatically save the project each time a procedure is run?  

14410
O
M
MZwanenburg
asked in AIMMS Language
Properly using index domain with 3 indices and 2 subsets

Hi all, I  try to implement the following index domain in a constraint but I get the error “,)” is expected. OperationsPOforJ(i) and OperationsPOforK(i) are two subsets of set OperationPOs. Am i making a typo or is it not possible to use two “in” functions in an index domain? 

541
gdiepen
AIMMS Champ
M
MZwanenburg
asked in AIMMS Language
Implementing limit on index in constraint

Hi all, I need to give a certain range to an index in a constraint, but I am not sure how to implement this in AIMMS. It is the following constraint:   In AIMMS already have this constraint but how do I change the constraint to the situation above?   

803
M
L
LennartEnthusiast
asked in AIMMS Language
How to assign an initial value to paramter with a unit?

Hi everyone, We are using version 4.82.3.29.I have a parameter called VOLL, that has the (implicit quantity) unit €2010/MWh. I want this parameter to have the value 3000 €2010/MWh at model start-up, which can then be modified through the UI if desired. I figured this would be straightforward but it is giving me problems. If I select ‘Initial data’, and use the wizard to specify the value 3000, AIMMS inserts the following code:However, this immediately leads to an error! "The symbol "[" is not expected.” ... Using Initial Data = 3000; (so without the unit specified) leads to VOLL having the value '-nan(ind)' at model startup, and 0 after executing the procedure that reads our database (and it is unclear to me why this procedure would affect the VOLL value). I also tried to use the ‘Default’ field (it is not entirely clear to me what its purpose is as opposed to ‘Initial Data’). If I enter the value 3000 there, the parameter has the value ‘inf’ on model startup and '9.98892e+12' after re

954
L
V
vixingitEnthusiast
posted in AIMMS Language
Loading library

Hello,  I’m trying to load a Library from repository but I keep getting this error :  Can you please help understand why ? Thank you

261
Chris Kuip
AIMMSian
O
olusegun.adenijiEnthusiast
posted in AIMMS Language
One-Stage Stochastic problem

Good afternoon all and happy new year. I wish to know if a stochastic model can have only 1 stage. If yes, how can I write this in AIMMS? By this, I meant do I create a parameter “PeriodToStageMapping” and just write 1 as the input? Many thanks...

483
Jess Es
M
AIMMS Partner
Marc WingenderAIMMS Partner
asked in AIMMS Language
model edit create input argument

Hello, Is there a way to define an input argument via model edting? I know I can create a procedure and define the body e.g.: {    _eProc := me::Create(_spProcName, 'procedure', _eSection);    me::SetAttribute(_eProc, 'body', _spBody);}

403
M
AIMMS Partner
G
AIMMS Partner
GuusjeAIMMS Partner
asked in AIMMS Language
Optimization license PRO VM

Hi, for an application, the optimization does not work on the PRO environment anymore, there are no results shown. Locally, the optimization works. While looking at the log files, the following error showed: 2022-12-21 14:12:14,255 0x00001a00 [INFO] {AIMMS.Incidents.ErrorLogger.ErrorCollectorStack} Error at line 30, body of user-defined function prOptimizationSolveStatementUtopia, with trackingId [8] triggered: [8] This license does not allow the operation: "solving mathematical programming models".2022-12-21 14:12:14,255 0x00001a00 [INFO] {AIMMS.Incidents.ErrorLogger.Error} Error at line 30, body of user-defined function prOptimizationSolveStatementUtopia, with trackingId [8] handled:[8] This license does not allow the operation: "solving mathematical programming models". We have a virtual machine on our own server (ORTEC) running with the relevant licenses and the CDM databases. The optimization is started using the pro::DelegateToServer procedure. How can I find out which license is

773
luispinto
Administrator
K
kira.west2020Explorer
posted in AIMMS Language
Memory statistics

Is there any further documentation for the MemoryStatistics function than what is available here?https://documentation.aimms.com/functionreference/development-support/application-information/memorystatistics.html#MemoryStatisticsI'm interested in particular in the differences between Memory actually allocated, Total memory actually requested, net physical memory allocated, really requested memory, etc… It's unclear to me the difference between “really” and “actually” requested memory.More information on “Percentage memory waste” would also be helpful.

552
Mischa
AIMMSian
T
trivikram.dokkaExplorer
asked in AIMMS Language
unable to reference set within one librarymodule from another librarymodule

Hi,I am trying to create a variable in librarymodule2 which uses index based on sets declared in librarymodule1. It throws an error saying: “The index “lm1::i” is not present in the interface of Librarymodule “librarymodule1” and therefore cannot be referenced from within variable “lm2::var”. I am new to AIMMS but my colleagues have done this sort of thing many times and never encountered this error. It is not clear how to resolve this.  BestVikram 

252
T
Chris Kuip
AIMMSian
Chris KuipAIMMSian
posted in AIMMS Language
"Multiple" for OpenAPI API's

In the previous how-to, making a single REST API call is illustrated.In this how-to, "single” is replaced by "multiple” in various ways:A single service can be provided by different servers. For instance from different regions.  Each server has its own service URL. A single service URL, can provide multiple methods. For instance, a method to find the geolocation (lat, lon) for an address, and another one, given a geolocation, finding an address. A single request can have multiple answers.  For instance, try searching for “Market square”. A single method can be queried multiple times.  For instance, searching the geolocations for multiple addresses. An organization may offer multiple pricing plans, each one with its own limit on the number of queries per time period. Often this starts with a free of charge plan, whereby only a few queries per time period are allowed.  

230
Chris Kuip
AIMMSian
R
RwitamJEnthusiast
asked in AIMMS Language
Variable and constraint modification from webui

Hi,Is there any way so that we can edit objective functions and constraints from the Web UI created by AIMMS developer license.Kindly let me know.  

201
Chris Kuip
AIMMSian
N
Noob9000Enthusiast
asked in AIMMS Language
Element NOT in Set

Hiya!Is it possible to cleanly scope for elements NOT in a set?The method we're using is set(index) <> 1, but this seems clunky.Is there something like:-set(index)orindex not in set

972
N
Sree
SreeEnthusiast
asked in AIMMS Language
Read and write delimited tabular files

What library is currently (and will be) supported for reading tabular data files that are delimited by specific characters - for e.g., tabs? Is there an option to specify delimiter in the DEX library for mapping these data files? Or, is the best course to use the CSVProvider (depedent on DataLink) and use ReadWriteAttribute?

642
F
N
Noob9000Enthusiast
asked in AIMMS Language
Initial Data Empty

Hey!I have some parameters that should initialize as 1 and then optionally be updated with a script. The weird thing is when I use Initial Data and define it as 1, they are empty!  Only one of the nine parameters populates properly as 1, the rest are blank. This has caused me to assign them all with := in the script at the beginning, but this is quite ugly and impractical. Is there something about Initial Data I'm not understanding? Let me know if you need more info! Here's an example of one that doesn't load, where i is a node index that works throughout the model:Parameter MultiplierPVCap {    IndexDomain: i;    InitialData: 1;} And the one that does load:Parameter MultiplierH2storage {    IndexDomain: yr;    InitialData: 1;}

532
N
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