Variable with Initial Value

Question

Hi everybod,I have a quick question and hope you can help me.I calculate in my model the optimal stock level depending on the period and szenario specific demand.The inventory level is defined as follows: Inventory_PreviousPeriod + ProductionQuantity_CurrentPeriod (also a variable) - DeliveryQuantity_CurrentPeriod.How is it possible to preset the variable stock for the first period to a fixed inital value (in this case the opening inventory)?I would be very grateful for your answer!Best ragards, Hans

luispinto · Accepted Answer

Hello Hans,I typically do this by including the initial stock from a parameter and conditioning that this will only be added if the constraint is being applied for the first period.Something like this:Constraint c_balance { IndexDomain: (i_period);  Definition:    (p_initialInventory | (i_period = 'period_1’)) + v_inventory(i_period - 1) + v_production(i_period) = v_delivery(i_period) + v_inventory(i_period)}Hence the “| (i_period = 'period_1’)"will only add the p_initialInventory parameter when i_periodo is ‘period_1’.Best regards,

Hans · Answer

Hu Luispinto,thank you for your helpful reply!This is exactly the kind of advice I was hoping for, you really helped me a lot.Thanks again and best regards,Hans

Variable with Initial Value

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