NX Nastran DMAP Programmer's Guide - Kxcad.net

MERGE
Matrix merge
Let [A] be an m by n matrix, {CP} be an nx1 vector containing q zero elements; and
{RP} be a mx1 vector containing p zero elements.Partition [A11] will consist of all
elements A ij of [A] for which CP j = RP i = 0.0 in the same order as they appear in
[A]. Partition [A12] will consist of all elements A ij of [A] for which CP j ≠ 0.0 and
RP i = 0.0 in the same order as they appear in [A]. Partition [A21] will consist of all
elements A ij of [A] for which CP j = 0.0 and RP i ≠ 0.0 in the same order as they
appear in [A]. The following describes the operations:
Let NC = number of nonzero terms in {CP}.
NR = number of nonzero terms in {RP}.
NROWA = number of rows in [A].
NCOLA = number of columns in [A].
Case 1: {CP} is purged and SYM ≥ 0:
MERGE A11,A21,,,,RP/A/1 $
[A11] is a (NROWA-NR) by NCOLA matrix.
[A21] is a NR by NCOLA matrix.
[A12] is not written.
[A22] is not written.
Case 2: (RP) is purged and SYM ≥ 0:
MERGE A11,,A12,,CP,/A/1 $
[A11] is a NROWA by (NCOLA - NC) matrix.
[A21] is not written.
[A12] is a NROWA by NC matrix.
[A22] is not written.
Case 3: {RP} is purged and SYM < 0:
MERGE A11,A21,A12,A22,CP,/A $
[A11] is a (NROWA-NC) by (NCOLA-NC) matrix.
[A21] is a NC by (NCOLA – NC) matrix.
[A12] is a (NROWA – NR) by NC matrix.
[A22] is a NC by NC matrix.
A11
A21
A11 A12
→ [ A]
A11 A12
A21 A22
→ [ A]
→
[ A]
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