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Good morning and a very good day to you!Dear Sir / Madam,Currently, I am running big data using AIMMS for my Final Year Project to produce an optimal exam timetable. My MIP model consists of 1 decision variable, 3 objective functions and 14 constraints.I encountered the same problem for many times when I was running my data. I realized that AIMMS will usually shut down on its own after running for more than 2 hours before even getting the results. I have checked my computer to see if it has any technical problems but I have not found any. Can you please help me with this problem? I am attaching a relevant picture for your further references. I am looking forward to getting a favorable reply from you soon. Thank you for your time and patience.

hello everyone,i have a question about my aimms project:i have two variables: x(t,k) and y(t,k)now i want to determine, thatif x(t,k) < y(t,k) then y(t,k) = x(t,k)i already know that this is not possible with an if-statement.has anybody an idea? Thanks in advance.Seb 

Hello everyone,i'm just a beginner and have a few problems with aimms. I am investigating a warehouse in which customer orders are split up into partial orders. Each partial order is assigned to a zone.My problem is that Aimms assigns the partial orders to multiple zones instead of just one. In the attachement you can see that a partial order is assigned to several zones. j are the partial orders; z are the zonesIs there a way to say in a constraint that only one value can be assigned? Thank you!!!

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

A very good day to everyone!I have a little problem here whereby I have keyed in all my data and details into AIMMS. However, I just found out that the UI I used is WebUI and not WinUI. May I know how to change the WebUI to WinUI without even deleting all the data I have keyed in?Thank you so much for helping. 

HI, Having the Math Program Inspector is one of the great add-ins of AIMMS. One of the features that I really like is the matrix summary, where I can see the smallest and largest coefficients. However, I want to identify which variables and constraints are involved in those smallest or largest coefficients. One way is to look at the matrix graphical representation, but my model is big and I couldn't find those small coefficients. Now I have some e-14 coefficients that cause numerical instabilities. I was thinking to scale my model, but I would like to find the variables and constraints related to this e-14 coefficient.  Is there any way to find the smallest or largest coefficients location in the matrix, without looking at the matrix graphical representation?

Hello community!I’m trying to encode my inventory balance constraint on AIMMS but when I click on “Check and close”, I receive this error message: “The constraint "Balanceinv" without a suffix cannot be used inside the definition of a constraint”.Has anyone experienced this problem before and can help me? I would be very grateful! 

Hello everyone,I have been using AIMMS for a short time and am still a beginner.When I encode my objective function, the following error message appears : “the scope of index “m” has not been specified”.I have tried several ways to solve this problem but none worked.Has anyone experienced this problem before and can help me? I would be very grateful!

Hi,If anyone can clarify the difference/similarity between Current Case and Active Case that would very helpful. Thanks,

Hello,I am trying to create Tables in a database using DirectSQL() function. There are 3 scenarions: DirectSQL("DRIVER=SQLite3 ODBC Driver; Database=Output.db","CREATE TABLE April2121 (Field1 INTEGER)"); Here the procedure is succesfully executed DirectSQL("DRIVER=SQLite3 ODBC Driver; Database=Output.db","CREATE TABLE 20210421 (Field1 INTEGER)"); Here it generates an error DirectSQL("DRIVER=SQLite3 ODBC Driver; Database=Output.db",FormatString("CREATE TABLE %s (%s INTEGER)",CurrentDate, Field1)); Here it generates an errorI need to create tables with names taken from string parameter “CurrentDate” and Column Name taken from string parameter “Field1” Current Date string parameter is defined as CurrentToString("%c%y-%m-%d").Could you please tell me where I am going wrong with this? I have attached screenshots for your reference.Thanks.

Started another round of playing around with the AIMMS webui and running into some more questions again   I think most of my questions originate from the fact I still think in the old winUI and trying to convert my mind into the webUI way of thinking I saw that the scalar widget has two ways it can display the contents, depending on whether you include one or more values: The top one is the style whenever you select a single scalar value, the bottom one is when you have multiple scalars to be displayed. Is it possible to use the second style if you just want to display a single scalar value? The underlying reason for this question is that I would like to create something like the DialogGetString functionality: create a dialog page that provides the user with a field to provide the name for a scenario or a case. Is there anything I am overlooking here? Am I trying to use the webUI in the old winUI way and should I be doing this in a different way?

Hi.I am trying to solve a large problem in parallel using asynchronous solver sessions. However, I get this error as soon as I start the simulation ‘The number of simultaneous solves by solver 'CPLEX' exceeds the license limit of 1.' I have CPLEX (Full) solver in AIMMS. Is this because I have a personal node locked AIMMS business license? How do I check the number of solver sessions that I can run simultaneously in AIMMS? Is there a way to activate the Parallel CPLEX option? Thanks.

Hi,  I am wondering if it is  possible to set a specific value for the best LP bound of  a  Mathematical program (before executing the Mathematical programof course)? Thanks

HI everyone, so I have to model a problem but when I run the procedure, it tells me: Warning: CPLEX: Q matrix is not positive semi-definite.Warning: Model status 13: Error no solution, Solver status 9: Error: Setup failure (see message window).I have no idea where my mistakes are, that's why I come to ask for your help.so here is my problem :I have 4 variables, X(j,i) and Q(i,l) are non negative and Y(i) and E(i) are binary variablesMy function to minimize is : sum( (j,i), csb(j,i)*X(j,i) ) + sum( (i,l), cbd(i,l)*Q(i,l) ) + sum( i, ce(i)*E(i) ) + sum( i, co(i)*Y(i) )My constraints are: sum(i, X(j,i)*Y(i)) <= capmp(j)sum(l, Q(i,l)) <= capb(i) + 50*E(i)sum(i, Q(i,l)) >= ed(l)8.333*(sum(j, X(j|j="Afyon",i))+sum(j, X(j|j="Konya",i))) + 9.091*sum(j, X(j| j="Import",i)) = sum(l, Q(i,l))sum(i, Y(i|i="Istanbul")) =1sum(i, Y(i|i="Ankara")) =1sum(i, Y(i|i="Izmir")) + sum(i, Y(i|i="Sakarya")) + sum(i, Y(i|i="Adana")) =1sum(i, E(i|i="Izmir")) + sum(i, E(i|i="Sakarya")) + sum(i, E(i|i="Ada

I wanted to know how is one supposed to take input from excel sheet when I publish my app on Cloud. I have tried uploading the excel sheet on cloud but I’m not sure how to locate the file on cloud and read data from that. Could you please guide me through this? Thanks.I have attached some screenshots for your reference.

Hi @Gertjan , We are really interested in using the Calendar widget in the WebUI. Is there any update on when will it be available?    Thanks, Cristina Sanchez Molero  

Hi,I want to read data for a parameter P(x,y) from excel file. The parameter is two dimensional.And the data lies in one of the sheet(say Demand) of a excel file(say DataFile). I have tried ReadList but it is not working as the range of x lies in  A2:A50 and the range of y lies in E2:E50 and data lies in T2:T50.Help me to read the data with out creating another sheet. 

Hi,how is it possible to obtain a worse outcome on a more powerful PC system? Are there solver options which are benefitial for a faster PC system?In my specific case, I run a Mathematical Program (MIP) minimizing a target function. Since the computation effort is quite high, I introduce an Upper Bound to reduce the solution set. However, if I run the identical probelm instance on two systems, the more powerful one is not able to even calculate a Lower Bound. I use CPLEX 20.1. Any idea why this could be or how to configure solver options? Thanks and best regards 

Hi,I am dealing with the allocation problem where my result is a binary variable. In the application the result, the data filled in the variable, is presented in a nice way but I cannot get it to work in the WebUI. Is there a way to get this done ? When trying to display the binary variable in a table in the WebUI, no data is shown. Kind regards,Marie

I’m using CSVProvider 1.1.1.2 for writing outputs to CSV.  While writing, certain rows are missing in the csv file where the variable values were 0.  When checking in AIMMS (right click variable → Data) I see the domain still has that index but empty value (which means it is 0).  However, while writing to CSV the index where variable values were 0 is missing.  Is it possible to either include a blank row or with values 0 for the index position where the variables were 0 ?

Is there a way to lock a page in Web-UI with a password?

I’m trying to define a limit to RAM memory available to solve a generated mathematical program. Is this function related to this? I tried code below, but it’s stoping my solve before the time_limit defined, before the the GAP defined and also is not using 24 GB available. And before I changed the code to use gmp functions it was taking more than 11 GB.   

Can AIMMS  interface  Python，such as tensorflow？

Hi,I want to build a model that can transport stuff from (i to j) directly or by stopping over at facility r.The transportcost (i to r) and (r to j) are cheaper than the direct transport (i to j). Problems:Open(r ) is either 0 or all possible r are opened and the amount is divided up evenlyEven if transportcosts are way lower for the extrastop r than without, the model does never choose to move all products past extrastop r. (capacities are more than enough)  (goal is to minimize total cost (fixed cost and transport cost included)Related Constraints:Amount(i,r)+Amount(d,r)<=Demand(i)*OpenRecycling( r) // index (i,d,r) sum(i,Amount(i,r))+sum(d,Amount(d,r))<=Capacity(r)* Open( r)   //index (r ) sum(r,Amount(i,r))+sum(r,Amount(d,r))=(Returnrate(i)*(demand(i))) //index (i,r) sum(i,Amount(i,d))<=Capacity(d)*open(d)      //index(d) sum(i,Amount(i,d))=sum(r,Amount(d,r))         //index(d)  Thanks for your help.I´m more than happy to post my model if that helps

I have a String parameter for BeginDateofCalendar which takes a string of date.I created a procedure for getting value for the above string parameter using DialogGetDate which gives me option to select a date from Calendar.But it only working in WinUI. When i am running the procedure in a page in WebUI its running but the calendar is opening in AIMMS App, not in WebUI.what should i do so that the calendar opens in WebUI and not in AIMMS App?