Ventana software support forum

Vensim optimization

Hello I am currently optimizing (i.e. matching simulated variables to the data) different models at the same time - they are actually different sectors of the same model. As I am switching between the models, I was wondering: whether it is possible to 'save' an optimization task in vensim? I.e. is i...

Hello, No, "DDisposable income" is not a constant - it endogenously simulated (by other variables - that are data-variables). And therefore, I thought the command got executed (hence, I have my 11 runs) , but the variable (DdDisposable income) did not actually change. Afterwards, I thought...

Hello Sorry that use this forum again for a challenge I face. I wanted to Vensim to do several runs by using a command file (see attached). 1) at the moment, for some reason the file is not convertible to a cmd file? 2) If I run the script (before, I converted it to the right format), nothing happen...

Thanks!

Tom, My question is different. I use now the model proj1.mdl (extended) as an example. In the original model is the following variable, using the following equation: Variant 1): Variable : max work accomplishment Equation: 8, 10, 15 I wanted to do the following: Variant 2): Variable: max work accomp...

Hello I would like to set up arrays/subscript. I don't have y entire model arrayed (for a number of reasons). However, I want to array one variable, in the following way: Subscript: Industries Equation: Price Agriculture,Price Construction,Price Energy supply,Price Finance,Price Information,Price Ma...

Ok, thanks, I think I understand this now much better !

Dead Tom, Many thanks for these clarifications, very helpful! The drawback with regard to the graphs is fine - I already 'installed' them. But good to know this is the only drawback, and I will certainly inform myself about the possibility to calculate the residuals ! However, just for clarification...

Hello, I have a question regarding optimization/calibration & vensim. First, some infos: At the moment, I have a model that uses some data via the possibility of "data-import" (and, this will not be changed, those are exogenous variables that use scenarios from other sources) and hence...

OK, many thanks!

It seems to work now (apart that from warnings)

Thanks a lot again

I receive the following type of warnings (not errors): - WARNING: Simulation starts before first time for exogenous variable - Demployed. - WARNING: Exogenous variable - Dbirths - in range at time 1996. - WARNING: Simulating beyond range for exogenous variable - Dbirths - at time 2014.25. All those ...

Dear Tom I see if I chose the 'Sim control" go to advanced and chose then the data sheet I need for the data that is imported, the simulation runs - although, I get a lot of errors saying that there is no data imported (although, it is clear that somehow the data is used as otherwise there woul...

So, what I did (in case I did not use the GET XLS Constants" is the following: 1) I went to "model -> import data set -> I chose the excel file and sheet etc. 2) If e.g. I want to have the data from the Excel sheet for the variable "GDP", I simply choose the data-option in the ty...

May-be to add: If I only have variables with the equation GET XLS CONSTANTS('Modelinputs010218.xlsx' , 'Initvalues','b3')
then this function works...

To whom it may concern I get the following messages when I want to simulate my model: 1) ERROR: The variable- DAccompany netmigration -and perhaps others require a data file be specified. 2) ERROR:Unable to correctly load in exogenous values - aborting." With regard to 1) This concern a variabl...