Optimization Tooling

Hello everyone, Since I’m starting on AIMMS, I have two little questions : One of my index, called t, goes from 1 to 15. But for one of my constraint, I need that it goes from 1 to 14. How can I express that on AIMMS ?  In order to get the bound after the addition of cutting planes by the solver, my teacher told us that we can limit the number of branch-and-bound nodes to 1 by going to menu solver options. The problem is that cannot find this menu on AIMMSCould you help me ? 

Can not deactivate because of 601 Error 

I have several problems but I think they are related to each other. For all my constraints I get the warning “The index “i” already has a scope” and I also get this warning when I want to enter my data. Also when I want to specify the objective for my Mathematical Program I get the warning: “Expecting a scalar identifier (no free indices)”. I’ve added pictures of one of my constraints, the warning from the Mathematical Program and my Set where I believe the problem might be with the index i. But I don’t really know how to fix it so if someone could help me I would be very grateful.  

Hi, I am going through AIMMS FOUNDATION COURSE, where trainer asked to declare Set Index as 1, 12 when i am doing that getting error that “The symbol '1' is not expected but a symbol like 'identifier' is expected.” 

Hi all,my question relates to the font size of axis labels when enlarging the respective widget to full-screen mode. The font size is fine on the normal page when the widget is its standard size. However, when zooming the widget, the font size stays the same, making it very hard to read.Especially when making screenshots of the charts to use in e.g. business presentations, it would help if we can adjust the label size when enlarging a widget.Any suggestions as to how I can do this?Thanks in advance 

I am trying to solve a model using AIMMS but it keeps giving me error "solver not called" what can I do pls? I have tried to choose solver for it but still not working

HelloI have created another model for practice on AIMMS for inventory optimization. There are no errors during compiling however I am getting the attached error while running the procedure in the Main Execution part. The model and the error have been attached as a zipped file for reference. Thank you for all the help! 

Dear All, My name is Mohamad Khaled and for my university research project I am using AIMMS to model a 3-echelon Pharmaceutical Supply Chain model. The current model I’m trying to define and solve is a simple one compared to some of the models I have seen here. I have two issues with my current model: The first issue is that the pharmaceutical products (AKA medication) has an uncertain demand which I am not able to properly define in the project despite indicating the index domain, using the uncertain option in the property setting and defining the box function with an upper and a lower value in the region area. (I attached a screenshot of the demand parameter with the descriptions and region and another screenshot of the current “nominal” data of the demand)  The second issue is the wastage/expiration of the medication. I have defined a shelf-life variable and respective constraint, however, I couldn’t get the shelf-life variable to be used in the wastage constraint as the following w

When querying data from a SQL Server using an ODBC driver (using SQLCreateConnectionString() and ‘trusted_connection=yes’ for the AdditionalConnectionParameters argument), is the authentication carried out for the service account running the AIMMS PRO service on the server or for the user logged into the PRO portal on an AD-linked environment? Is there additional setup required for double-hopping? Or does it depend on whether the AIMMS PRO service account is registered on AD?   I am looking for support to build solutions where the database serving the AIMMS application is restricted for use by specific individuals and not service accounts.

I have created a model on AIMMS for production. There are no errors but still we are not getting any result. I tried multiple modifications, but I am stuck. I am attaching the model for reference. The formulas have not been used anywhere else except for the attached files.

At AIMMS User Content we made a choice regarding the naming convention to be used and would like to share the considerations we had to derive at our choice. What do you think? What are the considerations you used for the naming convention you use?see Identifier naming convention

When you solve a Mathematical Program in AIMMS, the default behavior is that AIMMS will let the solver solve the problem to (local) optimality. There might be situations where you want to stop the solve procedure after a set time period, or once a solution within a given percentage of the best value is available. This article will show you how to apply different stop criteria to a 'solve' statement in AIMMS. Read More...

I would like to freeze the left most column in one of my tables. This column contains an identifier with no values in other columns. Is this somehow possible via CSS or some AIMMS logic I am not aware of?

I run Power System Optimizer (PSO) developed on AIMMS. The current version of AIMMS we have is 4.30.5.814 on the windows server. The software ran with no issues till last week. However, after probably the server update, AIMMS crashes each time I read input files and throws the following error: the thread tried to read from the virtual address for which it does not have the appropriate access. I am not sure what the issue is as the input folder has complete privileges for read/write.

Dear Community, I plan to work from the Python workbench to call AIMMS to execute the optimization for my research project. I have some questions about linking AIMMS to Python: 1) How do I execute the AIMMS file by calling it from Python? 2) Will the results be written back to Python? Or, how can I export the results to the Python workbench? Thanks in advance, I look forward to executing my research with AIMMS... Best regards,

Hi there,I’m having an issue with AIMMS which is preventing the advanced text editor from working.When I launch AIMMS I get a Windows pop-up asking to install the Microsoft .NET framework 3.5. Then in AIMMS I get the error:Unable to locate the SyntaxEditor .NET assembly, falling back to ordinary editor.However, my machine is already operating the .NET framework 4. I’m using a work machine so am unable to roll back/install the older framework.I’m running Aimms-4.76.1.1-x64-VS2017.Has anyone had this issue?Any ideas on how I might be able to get it working?Thanks for your help! 

In our team, we are working on a linear energy system model which is expanding every day. We use the LP Gurobi solver with multi processing. Currently, it has 250M non-zeros (after presolve) and we think it will grow to more than a billion. If the computational capacity (let's say several hundreds GB of RAM) is present, is there any limitation on the problem size on AIMMS side?In particular I am interest in any limitation on number of variables, constraints, or non-zeros? or any limitation on the capacity of committed RAM or number of CPU cores for parallel computing? 

It is probably very simple, but i cannot figure it out and i need to get it done asap. Really appreciate any help!I have created a project that runs and gives me solutions. Now, i need to create another version of my model with major changes, but to make it faster i would like to “save as” the entire current project and then start making my changes. the “save as” menu only makes another copy of .ams file within the current project, but doesn't make an entire new project. i also tried to export a section, but the “Export” menu is not active.could anyone advise on how?

I created a very simple pie chart using a parameter with one index with 2 elements, named “Actual and “Penalty”.I was expected that the pie chart showed me the names “actual” and “penalty” inside the wedges, like shown in the article: https://documentation.aimms.com/webui/pie-chart-widget.html I also tried an elementtextidentifier to the set I use, although I would expect this does not make sense since the element are already named.I can’t find anything related in the pie diagram options or do I miss something?

Hello, We load back job data (optimization infos) from AIMMS PRO to the user session. I would like to display the status of the job. I only found the status code parameter but nothing about what is the status code list and meaning. Can somebody help me with that?Thanks, Zsófi

Is it possible to initialize local parameters, which have the property RetainsValue set? The first time, that the procedure/function is called, I would like the parameter to be initialized by a certain value. Afterwards, when the procedure/function is called again, I would like the parameter to keep the value from the previous procedure call.If I set Initial data for the parameter, the behaviour of RetainsValue is lost and the parameters is initialized with that value in every call to the procedure.

I find that unit conventions are an effective way to display data in different units. E.g. capacity in #items/day, with accompanying cost €/day, are relevant numbers for location specific KPIs. On a higher level, we can change convention to e.g. #mio Items/year, or mio€/year.However, I don't want to apply the selected convention on all my model identifiers. E.g expressing cost per item as €/item, and not as mio€/mio Item when the yearly convention would be selected.Is there a way to override the conventions in model identifiers, and thus explicitly define what uom to always display?Thanks!

Hi All,For a project we are implementing a user is making changes to a relatively large table. The user has the possibility to store these changes in a database.However, when a user closes his/her browser after having made these changes and forgets to store the changes in the database the changes have to be made all over again. Is there a way to raise a warning when closing the browser? In this case that would refer to a user that has made changes, but has not stored them in the database.I know using a uponleave procedure works when navigating to a different page, however when closing a tab no warning is raised using such a uponleave procedure. Furthermore, I have seen multiple sites raising a warning when closing the tab, so curious to see if this is possible to do in the AIMMS WebUI as well! 

Hi community,I have a three-dimensional parameter I would like to import. I know how to import one- and two-dimensional parameters, but do not know how to do this one. The data is stored in excel (I have attachted a snapshot as illustration of the structure of the data), I can extract (with some formulas in excel) the range (AM3:AO32) from which i would like to import the data. I also know the number of products (6), number of locations (5) and number of time periods (3). Can someone help me out with this?