initial value

[neelu@nitw.ac.in]

Dear sir,
I want to get the backorders are started from the 0 instead of 1 with the accumulation in the given model so that I used simultaneous in the subtype of an auxiliary variable type. but it is memoryless variable.

How can I sovle this isuue in vensim.
I am very much thankful for your reply sir

[Administrator]

I don't understand. When I run the model, back orders does start at zero.

I also cannot see any use of the simultaneous function.

[neelu@nitw.ac.in]

in this model
demand at 0 is 278.684
Fill rate at 0 is 200
backorders at 0 are 0
backorders = INEG ( demand - Fill rate)
so I want backorders at 0 is 78.684. actually this appeared at 1
so how can I get this (78.684) at 0 and that should be accumulated for the entire simulation
please suggest any solution in Vensim for above-mentioned issue

even if I use the simultaneous equation for that issue but it is memoryless, so How can I do sir

[Administrator]

Your equation for back orders is

back orders = INTEG (demand-fill rate, 0 )

Change the "0" to "initial back orders" and give this a value.

initial back orders = 78.684
back orders = INTEG (demand-fill rate, initial back orders )