Ventana software support forum

Hello

I am making factory operation model.
Time Step :day
for several years
threeyears:(Y1-Y3) # subscript
startoperation[threeyears] =300,644,998

Factory manager decide of start day to operate in “startoperation” which has subscript “threeyears”
The “startoperation ” day is fixed during this year.

I hope,first year from time 1 to 365 set “startoperation[Y1]”.
But next year will change to “startoperation[Y2]” .

How to convert “startoperation[threeyears]” to dailybasis, like

Time 1,2, ,,,,,,,,365,366,367,,,,731,732,733,,,
STARRTOPERATION 300,300,,,,300,640,640,,,,640,998,998,,,

Please Support me

Not sure I understand the question.

Should the parameter represent the day of the year, and therefore have a range (1,365), or should it be the day from day 0, with range 1 ... n years*365?

Should the output be one value, or three values (one for each subscript element)?

Should the output be a step function or an impulse? i.e. 0 0 0 1 1 1 1 1 or 0 0 0 1 0 0 0 0?

Dear Tom

Thank you for reply.

Yes, I want to step data(signal) continue during one year.
I want to set step time (for example time=200) but it will turn to 0 in 365( finish of year).
And next year I want to set another start time. it will turn to 0 in 730(365*2).

I want to set these operation start time usign variable.

I'm not sure what you are trying to do. From your description here, maybe the MODULO function is what you need?

days in a year = 365
Day of year = modulo (time, days in a year)

Thank you for your comment.
I am not so good at English . Sorry bad explain.

I am considering factory operation model.

1)Material to use in factory will be decrease or increase by year using simulation.
2)Factory capacity is fixed to use material( ton/day).
3)factory manager want to finish operation until April end(want to close).
4) I think Vensim is ”Procedural programming”, so I should set start of operation day by trial and error.
5) So I want to include “startoperation" variable in model. Because, it will make it easy to change in "simulation set up".

I think this purpose is possible using Excel as time series data from 365*year with signal(o or 1).
If possible i want to simulate using only vensim.

best regard.

Can you use

days in a year = 365
Day of year = modulo (time, days in a year)

startoperation = if then else ( Day of year = 0 , 1, 0 )

OK ... it sounds like you want a repeating step that is 0 at the start of the year, switches to 1 at some point during the year, then resets to 0 and starts over. Something like this: