NX Nastran DMAP Programmer's Guide - Kxcad.net

1022
EQUIVX
Data block name equivalence
EQUIVX Data block name equivalence
Attaches a second name to an existing data block.
Format:
EQUIVX DBP/DBS/PARM $
Input Data Block:
DBP Primary data block.
Output Data Block:
DBS Secondary data block.
Parameter:
PARM Input-integer-default = 0. Equivalence flag. See Remark 3.
Remarks:
1. The main purpose of the EQUIVX is to save either storage space or l/O time or
both.
2. If DBP and DBS reside on different DBsets and PARAM < 0, then a copy of DBP
is made to the DBset on which DBS resides. The equivalence flag is broken and
the data blocks become separate. These rules apply only if the secondary data
block resides on a permanent DBset or DBS is not referenced on a TYPE DB
statement and its DBset is a scratch DBset. Therefore, it is recommended that DBS
is referenced on a TYPE statement and defined in the NDDL sequence with its
location assigned to the scratch DBset.
3. The following tables summarize the relationship between primary and
secondary:
Status with PARM < 0
DBP prior to EQUIVX DBS prior to EQUIVX DBS after EQUIVX
Generated Any Equivalenced
Purged or Not
Generated
Any Purged and not
equivalenced