Ventana software support forum

Hello Vensim team again Since the last time I advanced significantly on my model. Now I'm trying to implement a different exports dispatch and I need to use simultaneous equations and find zero so as to price to converge. However, vectors sizes of x and z are different and I have not been able to fi...

Thank you Tom As this is an electricity market model, i have some discontinuities in the supply curve. I understand the limitations that this create on the find zero function and I'm working on a different way to solve it, and thanks to your help know I understand better the nature of my problem (ze...

Hello, I wonder if it is possible to merge different vectors in one vector in vensim. For instance, assume I have 2 subscripts: sub 1 and sub 2. sub1= a, b sub2= c, d x[sub1]=1, 2; y[sub1]=3, 4; So I want to create a vector, whose size would be 4 resulting from the size of sub1 and sub2. Then the re...

Can you give an email?

I use zs=one such as the example of the vensim help. What do you mean exactly with "scaling the vector"?. I'm going to explain you briefly what I'm doing: It is about energy arbitrage. I use FIND ZERO to find a bid price. This is the price at which they bid at certain hours and with this p...

Hello, I'm having problems with the function "find zero". I have an error when running. It says "FIND_ZERO did not sufficiently zero" at several times and I have serious problems of convergence (differences up to 50000). I'm using find zero in order to find a price at which some ...

Finally I got it to work, thank you. It seems that when formulating the vector of priority, we should use the prices in a positive way. It is different to ALLOCATE BY PRIORITY, where you should use the prices with negative sign in order to give a higher priority to those producer with cheaper margin...

I'm trying to allocate some capacity within some buyers at a certain price. I tried to do it by using the functions DEMAND AT PRICE and SUPPLY AT PRICE, but sincerely I don't get to do it. It is the typical problem of building a supply curve and dispatching by merit order, such as happens in electri...

It seems that VECTOR REORDER does not work with subranges... I can create a new vector PCD: hs1,rr1,nuc1,lti1 and then create a subrange let's say PDCsub: hs1,rr1,nuc1->Tech, in case i need to do some calculation with both. Do you have another suggestion? P.s. You might add the use of subranges in t...

In the following example i have a subscript tech:(p1,p3) and all the equations use tech
Then, i created the subscript 'pdc': tech, p4
If you remove it, the model works again
See the file I attach
Thank you

I did not even used the subscript 'PDC'. I just created it and I got this error

Hello I had a subscript called TECH: hs, rr, nuc Then i created another subscript (PDC) taking all the elements from 'TECH' and added a new one (lti), i.e., PDC: hs, rr, nuc, lti When I run the model, i get this error: "All arrays must have same size last element for REORDER" Before creati...

I'm having a problem with the function allocation by priority. It is weird because i don't have any error in previous calculations but i'm having a Floating point error in the dispatch. Supose I have 3 producers (tech), which try to allocate their production at 2 different hours. The quantity of pro...

Thank you very much Tom, it worked perfectly

I tried to do it with 0 but it was not possible. If you want you can run the model i attached with 0 and the result is incorrect. I had to do this "price order max to min[HOUR,TECH]=2-price min to max[HOUR,TECH]" because it was the only way to find the complementary positions, which is the...

Hello everyone I'm having a huge problem with vensim when trying to reorder a vector. It gives the wrong results when entering a vector order (like svec from Vensim help). For example, i have a matrix of prices Price x tech=3,2,4;6,5,7; Then i use VECTOR SORT ORDER to calculate the vector of positio...