NX Nastran DMAP Programmer's Guide - Kxcad.net

MATMOD
Matrix modification
Remarks:
1. If the matrix input into this option contains more than one column and
SORTBOOL is used subsequently to operate on this matrix, all columns will have
their rows re-ordered according to the sort obtained from the column processed
by the MATMOD operation. In this case, the column that was selected during the
MATMOD operation to produce the sorted ordering will be guaranteed in sort.
Other columns may or may not have their rows in sorted order.
2. The output data blocks are in machine precision, regardless of the precision of the
input matrix.
3. NKEYS=2 provides a more repeatable sort in the presence of equal values in the
input, at the cost of longer run times. A test on a typical vector showed a
difference of a factor of approximately ten. If repeatability is not essential,
NKEYS=1 is the preferred choice.
Option P1=36
Reduce the GRID record in the GEOM1 table to the entries corresponding to grid
identification numbers specified in a Case Control set.
Format:
MATMOD GEOM1,CASECC,,,,/GEOM1R,/36/GRIDSET/S,N,NOGEOM1 $
Input Data Blocks:
GEOM1 Table of Bulk Data entry images related to geometry.
CASECC Table of Case Control command selections.
Output Data Block:
GEOM1R GEOM1 table with reduced GRID record.
Parameters:
GRIDSET Input-integer. SET Case Control command identification number which
contains a list grid point identification numbers.
NOGEOM1 Output-integer. Processing status flag.
+1 no grid data found matching gridset.
0 GRIDSET found and contents match some GRIDs in GEOM1.
-1 GRIDSET found and contents matches all GRIDs in GEOM1.
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