Editing GPSS (section)

=== Statistical Attributes ===

==== Queues ====
{| class="wikitable"
!Prefix
!Meaning
|-
|Qj
|The length of a specified queue in the block diagram. This quantity may be modified by the QUEUE and DEPART blocks. Example: Q50 for the contents of queue 50.
|-
|QAj
|Average contents of queue j (truncated).
|-
|QMj
|'''Maximum''' contents of queue j. This quantity is automatically maintained by the program
|-
|QCj
|Number of entries in queue j. Automatically maintained.
|-
|QZj
|Number of entries in queue j. Automatically maintained.
|-
|QTj
|Average time each transaction was on queue j (including zero entries). When referenced the value will  be truncated to an
integer.
|-
|QXj
|Average time each transaction was on queue j (excluding zero entries). Truncated.
|}

==== Tables ====
{| class="wikitable"
!Prefix
!Meaning
|-
|TBj
|The computed mean value of a specified histogram-type table which is defined by the user. The TABULATE block is used to enter values in one of these tables. Although the computed average can possess a fractional part, it is not retained unless the computed average is to be used as the independent variable of a function. Example: TB42 for '''''the''''' computed mean value of table 42.
|-
|TCj
|Number of entries in table j.
|-
|TDj
|Computed standard deviation of table j.
|}

==== Savevalues ====
{| class="wikitable"
!Prefix
!Meaning
|-
|Xj
|The contents of fullword savevalue j.
|-
|XHj
|The contents of halfword save-value j.
|-
|MXj(a,b)
|The contents of fullword matrix savevalue j, row a, column b. (a and b can be any other SNA)
|-
|MHj(a,b)
|The contents of halfword matrix savevalue j, row a, column b.
|}

==== Computational Attributes ====
{| class="wikitable"
!Prefix
!Meaning
|-
|FNj
|A computed function value. Only the integer portion is retained except when used as a function modifier in GENERATE, ADVANCE or ASSIGN blocks.
|-
|Vj
|An arithmetic combination of Standard Numerical Attributes which is called a variable statement and is defined by the user. Only the integer portion is retained. (See Chapter 4.)
|-
|BVj
|The computed value (1 or 0) of Boolean variable j.
|}