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AIMMS Developer

AIMMS Developer

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

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royAIMMS Implementation Partner

asked in AIMMS Developer

vishweshpatilAIMMS Implementation Partner

asked in AIMMS Developer

Password Protection

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

1 year ago

erika.hashigutiAIMMS Implementation Partner

asked in AIMMS Developer

Usage of GMP::Instance::SetMemoryLimit

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.

1 year ago

xyrAce

asked in AIMMS Developer

Can AIMMS interface Python，such as tensorflow？

1 year ago

Tom RolfExplorer

asked in AIMMS Developer

How to build a crossroad/ 2 ways

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

1 year ago

m1907Explorer

asked in AIMMS Developer

free Academic License

Hello, for a submission I just had to download AIMMS. I have applied for the Academic License to use it. After I received the verification mail, I proceeded exactly as described in the mail. However, I still can't really use AIMMS because I always get the following error message when creating a new project. As soon as I want to open another project, I also get an error message. When I want to implement a new model I can't add new sets, parameters etc. either. Any help is highly appreciated!

1 year ago

royAIMMS Implementation 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 year ago

afattahiEnthusiast

asked in AIMMS Developer

Running more than one instances of AIMMS at the same time

Hi, I these days, I realized a new limitation with the new academic license delivery. Before, I was able to run two instances of AIMMS at the same time. However, now I can only run one instance at a time. Here are my two main uses for parallel instances of AIMMS:I am dealing with a quite heavy energy system model that runs around 2 to 20 hours (depending on the level of details). Sometimes I need to run several scenarios for a specific sensitivity analysis. It would be very useful for me if I can run the model on several computers at the same time. Sometimes I want to continue coding in AIMMS while it is running a problem. Would it be possible to run two or more instances of the model at the same time for academia?

1 year ago

Jan Willem ter WeemeEnthusiast

asked in AIMMS Developer

example for reading JSON files

I looked into the example of the dex:: library and I tried the DataExchange example. However I still have trouble to get started in my own program. I want to read a JSON file like given in the attachment and use the data in some variables in my AIMMS program. Could someone help me with a simple example program?

1 year ago

RogerDaniloAIMMS Implementation Partner

asked in AIMMS Developer

Older AIMMS Tutorial Videos

Hi, I used to watch two aimms videos, one of them was about performance tunning of problens and the other was about infeasibility of models, but after the chanegs in the site I cannot find then anywhere. Doesn anyone remember of these videos and where to find them?

1 year ago

JonathanSchadeEnthusiast

asked in AIMMS Developer

Convertion unit MW --> MWh

Hi everybody, I am trying to convert the unit power [MW] into the unit energy [MWh] considerung the specific time duration per timestamp [h] or [qh]. Has anyone an idea how to solve that?

1 year ago

inkognitroExplorer

asked in AIMMS Developer

Export to Excel: Spreadsheet vs axll

I want to write data in Excel. Generally “Spreadsheet::Assign...” commands work fine. However, I fail to include zeros in the output in Excel. I want this:i/t 1 2 1 0 0 2 5 7 I get this:i/t 1 2 2 5 7 Now I found the “axll::” library and the axll::WriteTable command, which seemed promising. Unfortunately this seems to work differently, since commands need an open workbook, which the “spreadsheet::” commands don´t. Combining both worlds doens´t work either. Can someone help? I am very confused. Thanks

1 year ago

rahmatAce

asked in AIMMS Developer

Growth Formula

Dear All,I want to write an equation for calculating growth in a parameter or variable. As an example:Pop(t) = Pop(t-1) + GrowthFactor(t)*Pop(t-1)How to do this inside AIMMS?Thank you.

1 year ago

User SupportAIMMSian

posted in AIMMS Developer

Read and Write CSV Files

CSV files are a de facto standard for communication of data. AIMMS provides the libraries [code]DataLink[/code] and [code]CSVProvider[/code] for the serializing of CSV files. In this [url=https://how-to.aimms.com/Articles/csv/read-write-csv.html]article [/url]an example is provided for reading data from a CSV file.

1 year ago

vishweshpatilAIMMS Implementation Partner

asked in AIMMS Developer

Element Parameter not giving results

Looking at screenshots can anyone tell me why the element parameter Calc(i,t) is not getting calculated? The problem comes when I am using ‘shift’ unit of measurement. If I use standard units like day or hour, the element parameter gives correct answer.I need the data of element parameter to be as follows: For example for t=2021-03-01 00:00 answer for b1: 2021-02-01 08:00 (since we are deducting 2 shifts) and for b2: 2021-02-01 00:00

1 year ago

vishweshpatilAIMMS Implementation Partner

posted in AIMMS Developer

Error while opening Python demo model

I am trying to open the model that gives the demo of how to connect AIMMS with Python in AIMMS Developer, however I am getting an error and I am not able to open the model. The model given at the below link:https://how-to.aimms.com/Articles/487/487-aimms-with-python.html

1 year ago

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 year ago

Gloria QuintanillaFormer AIMMSian

published in AIMMS Developer

Writing documentation for your team and end users - Part II: Process

The goal of this series is to cover some essential concepts and best practices for app documentation. Check out Part I here. Get to know your audience You probably got the key facts about your users' needs and abilities when you started your project. Don’t forget these needs and abilities when you write your documentation! You’ll need to consider things like: what terms are they familiar with? what assumptions can I make about their knowledge? what do they really need to know? (hint: not your entire thought process when you made it, but how they should use it) how often will they use this app? which features will they use most frequently? Are different users using it in different ways? (hint: identify clearly which parts are useful to which users) Level up your writing skills It may (or may not) sound easy to write documentation, but in fact it takes training and practice for most people to write technical documents that are both useful and usable. One way to build this skill is

780

1 year ago

royAIMMS Implementation Partner

asked in AIMMS Developer

How to get a variable range subset of a set?

Hi,I am working on a project of delivery planning.In my model i have a constraint which defines the Unavailability of a vehicle for some time due to maintenance or already on a delivery. The Time a vehicle becomes unavailable is a parameter.the constraint is :Here,X_v,t → indicator variable for maintenance(whether need to go for maintenance)S(v) → time required for maintenance of vehicle v status_v,t → indicator variable for availability of vehicle v on day t I am unable to write it in AIMMS. how to get the range of tau ?i was able to get the range for a single value parameter h using SubRange function tau in SubRange(T, t, t + h)but for a parameter set S SubRange is not working. Writing S(v) in place of single valued parameter h giving me this error*There is a mismatch in the master sets of set "T" and domain set "S" in the first argument of the call to intrinsic function "SubRange". what could be a possible solution for writing this constraint if S(v) i

1 year ago

vishweshpatilAIMMS Implementation Partner

asked in AIMMS Developer

Calculating Non-zero Average

If I have a variable where row A is timeline with index t and B are calculated values, how to calculate Non-zero Average of Values in B?A 1 2 3 4 5 B 4 0 6 0 7

1 year ago

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