SIMSCRIPT II.5 Programming Language

SIMSCRIPT II.5 Programming Language
base pointer of
LIST
word 1 LIST(1) LIST(2)
word 2 LIST(3) LIST(4)
word 3 LIST(5) LIST(6)
word 4 LIST(7) LIST(8)
word 5 LIST(9) LIST(10)
Figure 6-11. Array Storage
When a system attribute is multidimensional, packing takes place at the data-storage level only; the
array pointer words are unpacked. Thus the statements:
and
normally dimension is 2
the system has a LIST(*/2)
reserve LIST(*,*) as 3 by 4
specify and allocate storage to LIST as shown in figure 6-12.
As with field and bit packing, intrapacking specifications depend on computer implementation. Table
6-2 shows permissible intrapacking factors for common 32-bit wordlength machines. Other implementations
have their permissible factors specified in the implementation manuals.
LIST(1,1) LIST(1,2) word 1
Base Pointer LIST(1,3) LIST(1,4) word 2
LIST(2,1) LIST(2,2) word n
LIST(2,3) LIST(2,4) word n+1
LIST(3,1) LIST(3,1) word m
LIST(3,3) LIST(3,4) word m+1
Row Pointers
Attribute values
Figure 6-12. Array Storage
268