Ventana software support forum

Hi, this is my problem. I have tried to be as specific as possible. I get an initial 4x4 (ij) matrix (M0) into the Vensim model. I get another two additional vectors where information is available on the expected growth in data cells originating (Oi) and terminating (Dj) in each zone. I need to obta...

Hi, can you help me?? or is not possible?
Thks

I tried with FIND ZERO function,but I can't (I did not know) do anything, because I got 2 subindex. I apologize if i was not clear. I need to estimate a future matrix (in this case "matrix 6") which is derived from base year matrix ("matrix 0") and the vectors "generation&qu...

Hi, can you help me to do this in a better, simple and/or elegante way? I start whit the "matrix 0" and the vectors "generation" and attraction", these are constants and the result is the "matrox 6". It is possible to do this in one step and do more iterations? Tha...

Sorry! here it goes again...

Hi, i'm building a model, but the simultaneous equations problem is unsolvable to me. I was trying to the simultaneous and fin zero functions, but did not work. The problem is (I think), that I use one variable (IVT car ij) to calculate a loop with many others, so I don't know where is the starting ...

Sooorry

I get the Vensim DDS V6.1

Sure...
Thks

Hi, I have several problems trying to get data from an excel 2010 file. There is the error message: My equation is: And the excel file is: Can you help me to fix the error?
Thks

Yes, but the point is that I need to use the last value of of the previous vector. Again, in t=0, V=[1 4 3 6 2 8], so in t=1, my new array will be V*= [14 3 6 2 8*2], using the last position, e.g. the eight (8) value from V. My problem is that I can not (I don't know how) use this value (in this cas...

One more question: how can change the last value (position) of each array with a new customized calculation? I mean, if I have the following array V=[1 4 3 6 2 8] in t=0, I need in t=1, calculate a new array V*= [14 3 6 2 8*2], for t=2, V**= [1 4 3 6 2 16*0.6] and so on. How can I do this in Vensim?...

Thanks a lot!

Sorry, wrong file. I'm trying to replicate the values. My starting vector is the column B (yellow) and from this point (t=0) I need to replicate the values of the following columns.
Thanks.

Hi, this is a post of my model (in Excel). I would like to reproduce this Excel model in Vensim. My starting point (t=0) is the column B (in yellow). The column A shows the subscripts. Then, i need to calculate in the next iterations (t=1, 2,...n) the column values shown in the Excel file. It is pos...

Hi, i'm trying to move variables over time into a vector, but i can´t. For example, I get a subscript i, so my vector Xi is [7 2 5 4 8 0 0 0] in t=0 (get from excel). In t=1, I need to get a new vector X'i = [0 2 5 4 8 3 0 0], for t=2, [0 0 5 4 8 3 9 0] and so on. First question: can you help me to ...

Ok, understood. But, there any way to fix that? We need teach vensim in our course.

Hi, we get an academic license for Vensim DSS. It is possible install the software (same version) in several PCs for teaching a course at our University?

Sorry if I already have definined my subscript i, I have to redefined? or create a new subscript?
ID is a new variable?
Thanks

Thks, but I do not quite understand the code. I already got the subindex i, I don´t understand this part:

subscript i ID = i

I need to do a cumulative sum over a vector according to V=ai+ai-1. For example:
Vector = [2, 4, 6, 3, 8, 1]
I need a new vector: V*=[2, 6, 12, 15, 23, 24]

There are a function for this?
Thks...

Thanks, but I can't understand completely. It is possible to get a small model with this?

Hi, i try to make a multiplication bewtween a vector and a scalar. I need the result in another vector, but i can´t do that. I need some help.....
The multiplication is:

Well, i would not mind that model executes slowly. The model info is the following:

Ok, thank you Tony. So, it is impossible to expand the memory?