Returns the oldest elements in queue such that the sum of their total attributes add up to quant. For example, suppose you have a queue of orders (Order) with an attribute of order size (Item/Order). You would pass this function the processing capacity (Item/Day) times TIME STEP (Day) to determine how many orders could be processed today.
Restrictions: The first argument must be the name of a variable defined using QUEUE FIFO ATTRIB. If you use any other variable as an argument QUEUE ATTRIB QUANTITY will return :NA:.
| Units: | QUEUE ATTRIB QUANTITY(queue units,attrib units*queue units) --> queue units |
Example
| in process = QUEUE FIFO ATTRIB(orders,completions,order size,0, |
| flat,flat,100,1,10) |
flat ((0,1),(1,1))
completions = QUEUE ATTRIB QUANTITY(in process,capacity * TIME STEP) / TIME STEP
Here flat is simply a flat Lookup so that the age distribution is even and the attribute distribution is constant at 1.
When necessary, this function will allocate part of the inflow from a later time to meet the quantity. If there is not enough in the queue to meet the target quant then the total amount in the queue will be returned.
Availability: Not PLE or PLE Plus
See also: QUEUE FIFO ATTRIB
Sample model: QUEUE ATTRIB functions.mdl in FunctionExamples
