Decrement of a variable or attribute’s value. It subtracts one (the default) or more from the value of the variable or attribute.
DEC name [, expression]
name This is the name of the variable or attribute to be decremented.
[expression] You can optionally decrement the variable or attribute by more than one using an expression which can be a constant or a mathematical expression. The name and expression must be separated by a comma. (The square brackets illustrate only that this element is optional.)
The following are several easy-to-understand examples. The first decrements the value of v_ Var1 by one. The second decrements the value of a_ Attr1 by five. The third decrements the value of Number_in_System by the value of an attribute called a_ Batch_Size.
1) DEC v_Var1
2) DEC a_Attr1, 5
3) DEC Number_in_System, a_Batch_Size
Combining the DEC statement with the INC statement allows visualizing work in process (WIP) in a model, an area of a model, or a queue. For example, a hospital might want to track the number of people in the waiting room to visualize waiting volumes when changing model operations.