Optimization Tooling

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? 

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?   

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

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

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);}

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

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.

Just wanted to know if it is possible to style the buttons in AIMMS based on information from the model. What I have in mind is allowing the user to open for example 25 different pages (e.g. for different inputs) by providing 25 different buttons.I would like to style these buttons in such a way that if the input that corresponds to the page this button opens contains an error, the button should be red or I would like to include a red Error symbol (think might be possible with unicode and variant selection?) on that button and if there are warnings, I would like to make it yellow or have a yellow warning symbol. Green checkmark could indicate there are no issues with that particular input. It could also be that buttons to open the 25 different inputs are not the best way to this from UX perspective. If that is the case, what would you recommend?

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 

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.  

Hello everyone. We are trying to change a specific identifier in our table to a button that opens a dialog page. It’s the last column within this table:   However, as you can see in the image, our CSS styling is applying this change to all checkboxes within the table: .tag-table[data-widget\.uri*="tbl_PlanoOperacional_Tratos"] .cell-wrapper input[type=checkbox][class*=boolean] + span{ background: white url(images/floppy-disk_roxo.png) no-repeat 50%/contain;}   We have already tried to change it using annotations, but we weren’t able to make it work out. Is this possible? Thanks!

As we mentioned in our recent WebUI meetup, we would like to gather your feedback on the new widget types we are building. We’d love to hear your thoughts in the survey below.Below is the proposed order in which we plan to develop the new WebUI Widget TypesFlowchart Scatter plot Sankey Gauges  (RPM) Mekko / variwide Spider web Waterfall FunnelShare your feedback to let us know if some widgets have priority for you. We also have some follow-up questions which will help us better understand your needs. 

Hi there! I was wondering whether the behavior of the select all/select none buttons in e.g. the multiselect widget can be adjusted easily. I often use the search bar to get to a subset of my elements which are relevant for selection, which I would like to (de-) select with one click. I would expect that the select all/none button in this case only affects the subset which matches my search. On the contrary, these buttons are overruling whatever you type in the search bar, applying the (de-) selection on all elements, making it more cumbersome to apply “mass selections” on convenient subsets. Is this something you are working on?

Hello all!I was looking back through some old custom CSS code and the new way of theming using CSS properties. We have some very custom CSS code that, for example, selects specific widgets or specific pieces of the WebUI, and we would obviously like to keep this custom CSS code while still taking advantage of the new WebUI styling that has come out in the last year.However, I know recently some updates to WebUI, esp. the new 16-color palette, caused some issues with backward compatibility. Are there best practices for maintaining custom CSS code that may not be affected (e.g. “don’t use custom styling for x kinds of widgets or y kinds of selectors”). I am referencing the post here (), which mentioned that it should be possible to combine the “old ways” and the “new ways” of doing things. I guess I am just looking for some guidance on the best practices in ways to go about this to ensure forward compatibility.

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.  

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

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?

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;}

Hi AIMMS Community,I am writing a procedure to read in data from an Excel file using the DEX library. Some of our tables have binary data written as strings: “TRUE” and “FALSE”. I have been unsuccessful in reading these values, and am seeking guidance. Here is a simplified exampleTest data, I’ve also attached it to this file: And the XML file (also attached):I tried a few tests to read in the column with TRUE/FALSE :Read into P_test(i_test), a parameter with binary range Read into P_test(i_test), a parameter with no defined range Read into SP_Test(i_test), a string parameterAdditional Notes:The set “s1” reads successfully into i_test. “value2” also successfully read into SP_Test2. “true” autocorrects to “TRUE” in Excel, so it seems that Excel is doing something to format these values. When I save this tab as a CSV, the values show as strings “TRUE” and “FALSE”. We have used the most recent DEX library version (2.0.0.1)

Hello,I am using IPOPT 3.11 solver in AIMMS version 4.87. I tried to solve a Nonlinear model using IPOPT solver, but it shows the message below in the progress windows and does nothing. Any clue on this issue or potential solution?Thank you very much in advance. 

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.  

In our project we set options manually. For example, we have lines of code like ‘option CPLEX_22_1.integrality := 1e-05;’. For a specific case that we have, we would like set all these options to their default values and run the case again. What procedure can we use for this?Two things we tried that did not work:We cannot just remove all lines of code where we manually set options, since the case that we have problems with has been run before; hence, the default options in this case have already been overridden. We also tried using the procedure ‘OptionGetValue’ to get the default value and set every option to its default value, but this does not work for the majority of our options. For example, when applying our procedure to the option ‘Advanced_Start’ we get the error ‘Option not found, or not a numeric option’. Another example is the option ‘CPLEX_22_1.integrality’; in that case we get the error ‘The option “CPLEX_22_1.integrality” has not been found’.Thank you! 

Hi everybody,I am new to AIMMS and just started the AIMMS Learning Game (G-AIMMS) on the tutorial site (https://how-to.aimms.com/Articles/363/363-getting-started-tutorials.html). However, I am stuck on level 1a (Gathering Ingredients), specifically at the part where I have to add the restriction that at most two markets can be visited. Can anybody help me or does anybody have the solution code?

Hello,I'm trying to do some sensitivity runs where I scale a parameter each run and resolve.The problem is I can't seem to very simply make an array to loop over to scale the parameter. Basically this:FOR x in [50, 75, 100] DO   y = x * z;   solve LP;ENDFOR Just creating the array and looping through it is giving me trouble. I don't know the best way - import the array as a parameter? Then it gets mad it doesn't have an index? But it doesn't even really have an index. Then x has to be a declared parameter as well?Is there an easy way to do this or maybe it's because AIMMS isn't made for scripts? I can't seem to find a syntax guide that talks about declaring an array parameter.Thanks for helping a noob!