Ventana software support forum

Is it possible to change y scale in a graph, such as reduce the the maximum number of the y scale?

Thanks for the prompt reply. The example model is just a rough idea, and I will post the more detailed one when it is improved. Currently, what I want to know from the example model is if it is correct to say the time base for variables such as labor required and total labor cost becaomes month, rat...

Thanks for joining the discussion. The units of time in example 2 and example 3 are month, not year. Please have a look at the attached file. What I want is a model with year as unit of time, but have home seasonal variation on demand to result in different labor or capacity required. What I am conf...

I managed to have seasonal variation in a model which unit of time is year. However, I am confused by another question. Please have a look at the attached file and tell me if it is correctly to know how many labors are required every month by dividing monthly demand by working hour. Shoud the workin...

hello again, my result of annual demand always stay 0 or the number i put in the equation in this case, but i could not figure out what the problems is. what is the difference between sample in true and if then else? the examples about sample if true in the manual are not helpful. max workforce = SA...

Hi Bob, I tried to use your examples for calculating annual demand, but get the warning messags. what do these two messages mean? annual demand = SAMPLE IF TRUE(MODULO(Time,Months per Year) = 0,cuming annual demand,0) ~ $ cumming annual demand = cum annual demand + demand * TIME STEP ~$ cum annual d...

I have two more questions about the topic.

1. Is it correct to set the unit of time as year and time step as 1/12 and save result every time step in this case?

2. how do I calculate the average sale per year and total sale per year?

thank you very much, Bob.

Hope my explanation below would be clear. I want to build a model whose time unit is year for simulating capacity addition and production. Because demand varys a lot by season, including seasonal variation for demand is prefered. In this case, monthly production and capacity utilisation can also be ...

Could anyone please help me with the problem?

I want to build a model based on year, but with seasonal variation. Would vensim be possible to implement the idea and how?

Thanks a lot to Jeroen and J.J. Laublé.

An example from Jeroen will be much appreciated since you understand my question correctly. In addition, I don't really understand how to set up the priority between different machines and what width mean.

Thank you, J.J. Laublé.

The merit of order here means cost, and capacity here means the limitation of output for each technology. Dmenad has to be met by minimise the supply cost, and the price will be decided the cost of last unit to meet the demand.

do you understand my question now?

my question here is that there are two compnies in the market and each company has three technologies to produce the same product, but with different cost and capacity. the demand is met by merit of order, and the cost and capacity of each technology may vary. how should i do this in vensim?

I have a professional version and want to create a supply curve as the attched file in the model. Is allocation by priority the function for this? I cannot really understand how to use the function from the manual and wish to get some help. Is there any other way to produce a supply curve from the d...

thank you very much indeed

i tried to use tabbed array by following the example in the manuals, but it did not work. can anyone provide me an example with two subscripts?

I don't really understand what the problem is. It happens sometimes when I just add a new variable. Some names of other variables are also changed automatically when this happens.

My vensim professional keeps on shuting down itself sometimes. How can I deal with this problem?

Hope you can understand what I mean in the attached file. I am really new to SD and Vensim.

Thank you, Tony.

However, I don't understand your points very well. Could you please give me a simple example in vensim?

I used powersim before, and the it can recognise the different time units, such as day, month and year, and transfer them automatically. Does vensim also has this function? I want to use yearly data mainly, but has some seasonal variation for some variables. How can I do this in vensim?