AIMMS Developer

Topics about getting started or leveling up as an AIMMS developer. Datalinks, AIMMS language, building apps...

  • 578 Topics
  • 1,259 Replies

578 Topics

R
AIMMS Partner
royAIMMS Partner
asked in AIMMS Developer

How to get an attribute value from a Variable?

I have a Binary Variable X(C,V,T).Suppose for  t  and v  , X(c,v,t) is 1 for a c1  in C.I have another element parameter/variable (Range in C) F(V,T).now using this variable X how can i find F(v,t) = c1    

1
mohansx
2 years ago
gdiepen
AIMMS Champ
gdiepenAIMMS Champ
asked in AIMMS Developer

Proxy settings for GeoFindCoordinates function

Hi, I was using the GeoFindCoordinates function in AIMMS to map a given city name to a lat/lon combination and received an error message all of the time. Then I remembered I was on VPN and maybe there was an issue with the connectivity, so I disabled my VPN connection and tried again and the GeoFindCoordinates was able to execute without a problem.Whenever I am connected to the VPN connection at work, all my outgoing connections must go via a proxy server. Almost all programs I am working use the standard http_proxy and https_proxy environment varaibles, but it looks like GeoFindCoordinates is not doing this.I know there was a possibility to provide proxy settings for activating a license, but I can’t seem to trigger that option (as this seems to use my IE proxy settings).Is there any other way that I can set the proxy settings for this function? Also, could there be a potential for any other functions (like calling webservices, etc) that make outside HTTP(S) connections that they do n

2
gdiepen
AIMMS Champ
2 years ago
RoxannaBindenga
AIMMSian
RoxannaBindengaAIMMSian
published in AIMMS Developer

Friday Demo Impressions (May 12, 2023)

On Friday, May 12th, we had our internal Demo & Feedback session. The following topics were discussed: WebUI: enhancement in collapsing parent tasksPreviously, it was not possible to collapse the parent if one of its child steps was active: Based on users’ feedback this has now changed. It is possible to collapse the parent, and a blue line will indicate that one of its children is still active, hovering over it showing the name of the active step: New function: webui::RefreshAllWidgetsBy default, the AIMMS UI will only update after a procedure has fully run. However, sometimes you want to inform the user in between; a function for which, in WinnUI, PageRefreshAll was introduced. This function however didn’t work for WebUI. For the same purpose @Koos Heerink now introduced the new function webui::RefreshAllWidgets:You can use this function in combination with webui::UseTransparantVeil to make the ‘overlay’ on the page transparent for as long as the procedure is running (but bear in

320
RoxannaBindenga
AIMMSian
7 days ago
User Support
AIMMSian
User SupportAIMMSian
posted in AIMMS Developer

How to add a new libary to the current project

In the context of the AIMMS environment, a library is an AIMMS project that can be included in/added to other AIMMS projects. Each library in AIMMS contains a subset of project files. You can divide a large project into smaller sub-projects, enabling multiple developers to collaborate easily by sharing parts which are relevant to the entire project. Read [url=https://how-to.aimms.com/Articles/84/84-using-libraries.html]here [/url]how to add a new libary to the current project

0
User Support
AIMMSian
4 years ago
Jess Es
Administrator
Jess EsCommunity Manager
published in AIMMS Developer

How to Get More Log InformationHow-To

As a modeler, you can find detailed logs to analyze an issue before reporting it to support or on the community. AIMMS comes with loggers, a logging feature somewhat similar to the log4j technology. A good tactic for analyzing these logs is to scan for [ERROR] or [WARN]. When an error or warning is related to the issue you are analyzing, check the lines just above it. This article provides two files that are templates in creating this information. Read more...

310
Jess Es
Administrator
3 years ago
X
xyrAce
asked in AIMMS Developer

Model Variables with Limited Values

 I want to express “State_CHP=0 when Input_energy(t,conv)=0” and “State_CHP=1 when Input_energy(t,conv)>0”, but there always some errors. I have checked the help manual, but there is no specific example of how to explain it.Thank you very much. You will be of great help to me. Thanks.

2
X
1 year ago
R
RwitamJExplorer
asked in AIMMS Developer

Data fetching through bigquery using AIMMS

Hi,How to fetch data in AIMMS from a google cloud platform (GCP) database.There is a .JSON file with me along with the queries.  

1
M
AIMMSian
6 months ago
T
tj0822Newcomer
asked in AIMMS Developer

Can I get registry value in AIMMS?

I want to get registry value to check for dll registration.Is is possible in AIMMS?Please help me.

1
gdiepen
AIMMS Champ
2 years ago
M
MarvExplorer
asked in AIMMS Developer

summation over subset of an index

Hello everyone,I’m new in AIMMS and need help for my thesis. I need to implement the following constraints: t is an index for the period, here t = ( 1,2,3,…,T )How can i set the initial value from E(t=1) = Q How can I implement the E(T+1)  Thank you in advance kind regards  

1
gabiservidone
AIMMSian
2 months ago
User Support
AIMMSian
User SupportAIMMSian
posted in AIMMS Developer

How to Change the Default Solvers Used

Depending on which solvers are allowed by your AIMMS license, you might have multiple solvers capable of solving a given type of mathematical program (e.g. LP, MIP). In this case, you can instruct AIMMS in a variety of ways which solver should be used to solve a problem of a specific type. [url=https://how-to.aimms.com/Articles/178/178-change-default-solver.html]Here [/url]is explained how to change the default solver

0
User Support
AIMMSian
4 years ago
Chris Kuip
AIMMSian
Chris KuipAIMMSian
published in AIMMS Developer

ProfilerRunCompare App

Existing successful applications often have several features. To realize all these features there is a significant body of code.An application developer may be faced by a small change that causes significant differences in runtimes.Examples of such small changes are:a change in data,  a code hotfix,  a switch of computing environment, or two different persons operating the application.The location of the code where these performance differences manifest themselves may not be obvious. Facilitating the adage: measuring is knowing: the AIMMS engine provides the diagnostic tool: AIMMS Profiler.The AIMMS application ProfilerRunCompare is a small tool to compare two profiler runs. Come and check it out here.

300
Chris Kuip
AIMMSian
8 months ago
User Support
AIMMSian
User SupportAIMMSian
posted in AIMMS Developer

How using Calendars in AIMMS can make working with time a lot easier

Many models involve some time-based notion. This article explains how using Calendars in AIMMS can make working with time a lot easier. Find out [url=https://how-to.aimms.com/Articles/189/189-using-calendars-in-aimms.html]here[/url]

0
User Support
AIMMSian
4 years ago
User Support
AIMMSian
User SupportAIMMSian
posted in AIMMS Developer

How to Encrypt Projects to Protect Intellectual Property

This [url=https://how-to.aimms.com/Articles/128/128-Intellectual-Property.html]blog [/url]posts illustrates how you can create an encrypted project out of the source. The steps required to create an encrypted library will be discussed here as well.

0
User Support
AIMMSian
4 years ago
Jess Es
Administrator
Jess EsCommunity Manager
published in AIMMS Developer

How to write data to a tableHow-To

A database table may not always match the data in the related AIMMS model. In addition, we may want to write all possible elements explicitly, or just a predetermined selection of rows instead of just the non-zeros. Last but not least, from the context in the application, it may be clear that all of the data is changed, or just one or a few rows. This is why it is important to select the number of rows to be written (all or few) and there are several tactics available to help you make this selection. We discuss the following tactics in this article: Writing non-zeros directly to the database table. Writing all possible elements to the database table. Writing a selection of rows to the database table. Insert a single row into a database table. Read more...

300
Jess Es
Administrator
3 years ago
Jess Es
Administrator
Jess EsCommunity Manager
published in AIMMS Developer

How to Change Chart View on a PageHow-To

The end user can change the view of 2D charts (e.g. scaling or moving). This article describes the view options and shortcuts available. [list] [*][b]Scale[/b] - Hold down both mouse buttons and press [code]Ctrl[/code]. Move the mouse up to increase the size of the chart. Move the mouse down to decrease the size of the chart. [/list] [list] [*][b]Move[/b] - Hold down both mouse buttons and press [code]Shift[/code]. Move the mouse to reposition the chart. [/list] [list] [*][b]Zoom[/b] - Hold down the left mouse button and press [code]Ctrl[/code]. Drag the mouse to select the area to zoom. [/list] [list] [*][b]Rotate[/b] - Hold down both mouse buttons. Move the mouse up or down to rotate. [/list] [list] [*][b]Reset[/b] - Press the [code]R[/code] key to reset to the original view. [/list] For further reading, check out our other articles on [url=https://how-to.aimms.com/]HOW-TO[/url]. And feel free to share your tips for end user options in the comments!

300
Jess Es
Administrator
4 years ago
Jess Es
Administrator
Jess EsCommunity Manager
published in AIMMS Developer

How to use Local Binding vs. Default BindingHow-To

In this article we will compare two ways of defining index binding: local binding and default binding. Assume there are two sets: [code]Set s_RootSet { Index: i_rs; } [/code] [b][img]https://clipboardjs.com/assets/images/clippy.svg[/img][/b] and [code]Set s_SubSet { Index: i_ss; } [/code] [b][img]https://clipboardjs.com/assets/images/clippy.svg[/img][/b] Let’s compare the expressions [code]( i in MySubSet )[/code] and [code]( i \| i in MySubSet )[/code]. [url=https://how-to.aimms.com/Articles/243/243-local-binding-vs-default-binding.html]Read more...[/url]

300
Jess Es
Administrator
4 years ago
V
AIMMS Partner
vishweshpatilAIMMS Partner
posted in AIMMS Developer

Problem in reading database

Hello, I have linked an SQLite Database with my model and I am trying to import the data present in database to a parameter PXTankAllocation, however, it is not importing and it does not give out any error too.  have attached screenshots for your reference. If you will see S5 image, it is a screeshot taken after I have run the procedure readdb.Please help me with this. Thanks.Regards,

1
Chris Kuip
AIMMSian
1 year ago
User Support
AIMMSian
User SupportAIMMSian
posted in AIMMS Developer

Transfer a Developer License to Another Machine

An AIMMS developer license can only be used on one machine at a time. There may be situations where you need to use AIMMS on a different machine, either temporarily or permanently. This article explains how to transfer an AIMMS license for use on a different computer. Click [url=https://how-to.aimms.com/Articles/195/195-transfer-developer-license.html]here[/url]

0
User Support
AIMMSian
4 years ago
User Support
AIMMSian
User SupportAIMMSian
posted in AIMMS Developer

Use Constraint Programming to Solve ROGO Puzzle

The ROGO puzzle, [url=http://www.rogopuzzle.co.nz/]rogopuzzle[/url], challenges players to find a good path on a board, pick up treasures, and avoid pitfalls. This puzzle, and its corresponding iPhone app, were originally developed in New Zealand. In this post, I’ll explain a method for solving ROGO puzzles using constraint programming in AIMMS. Find out how to solve it [url=https://how-to.aimms.com/Articles/138/138-ROGO.html]here[/url]

0
User Support
AIMMSian
4 years ago
User Support
AIMMSian
User SupportAIMMSian
posted in AIMMS Developer

How to Retrieve Solver Log Files in AIMMS Developer

Solvers can share information about the solution process up to a very detailed level. To avoid overhead in generating information that is not inspected anyway, the AIMMS IDE defaults to not sharing any information. [url=https://how-to.aimms.com/Articles/13/13-Solver-Logging-IDE.html]Here[/url]

0
User Support
AIMMSian
4 years ago
User Support
AIMMSian
User SupportAIMMSian
posted in AIMMS Developer

How to Link AIMMS with Tableau

Although both the traditional AIMMS Windows UI and the new AIMMS Web UI offer excellent data visualization capabilities to view the data present [i]within[/i] an AIMMS application, many of our customers have expressed the wish to be able to view and work with AIMMS data in Tableau (and other BI tools such as QlikView, or Spotfire). This allows a much wider audience within a company to track KPIs on dashboards based on the results from an AIMMS application, using a wider range of graphical capabilities to drill down into the data presented, and to cross analyze these results against data from various other corporate data sources. [url=https://how-to.aimms.com/Articles/124/124-tableau-integration.html]Here[/url]

0
User Support
AIMMSian
4 years ago
afattahi
afattahiEnthusiast
asked in AIMMS Developer

How to interrupt a procedure with an if condition?

Hi, I want to interrupt a procedure with an if condition. For example:if (a condition) then   TestProcedure1;else   *interrupt current procedure;endif; I know I can use BREAK; to stop the loops. But how can I stop a procedure?

1
M
AIMMSian
1 year ago
Patrick
Administrator
PatrickAdministrator
posted in AIMMS Developer

Analyzing infeasible Problems in AIMMS

This webinar is from 2014 and contains a lot of (still current) information about how to investigate the cause of Infeasibility in AIMMS. Webinar - Analyzing infeasible Problems in AIMMS

0
Patrick
Administrator
1 year ago
Jess Es
Administrator
Jess EsCommunity Manager
published in AIMMS Developer

How to Extract XML File from a Server with the HTTP LibraryHow-to

In this article, we will create an HTTP request to extract a file from a server without an identification system using the AIMMS HTTP library. An [b]HTTP request[/b] is used to communicate with servers. The following information is needed for the request: [quote][b]Method[/b] : The action you want the server to do. The most common methods are:[list] [*]GET (obtaining an object) [*]POST (sending an object to the server) [*]DELETE (deleting an object from the server) [/list][b]URL[/b] : The address of the server where the request should be addressed.[b]Headers[/b] : The headers are specification of the request. For example, specifying the type of file you want from the server. You can find a list of possible Headers for your request in this [url=https://en.wikipedia.org/wiki/List_of_HTTP_header_fields]Wikipedia article[/url].[b]Body (optional)[/b] : Used to store data you want to send to the server, for example in a POST method request.[/quote] [url=https://how-to.aimms.com/Articles/2

290
Jess Es
Administrator
3 years ago
mohammadansari
mohammadansariAce
asked in AIMMS Developer

A DataChangeMonitor with ID DataChangeMonitor001 does not exist.

I encountered this error when running the model. The model is fine, since it works with another set of input data. But with this particular data set, it gets stuck in the Presolving phase, and returns nothing. After force exciting the model, This is the message that it shows in the .err file. Have the same issue when running on the cloud as well.

2
mohammadansari
1 year ago
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