NX Nastran DMAP Programmer's Guide - Kxcad.net

MODTRL Modify trailer
Modify data block trailer data.
Format:
MODTRL DB//P1/P2/P3/P4/P5/P6 $
Input Data Block:
DB Data block with trailer that is to be modified.
Parameters:
Pi Input-integer-default=-1. New value for i-th trailer word.
MODTRL
Modify trailer
Remarks:
1. Negative parameters are ignored. Nonnegative parameters cause the
corresponding word of the data block trailer to be replaced by the value of the
parameter.
2. MODTRL should be scheduled immediately after the functional module that
generates the data block. For example:
ADD I1,I2/O1 $
MODTRL O1////6 $
EQUIVX Ol/O2/ALWAYS $
3. If MODTRL is used to increase the number of columns in a matrix, then the
resulting matrix is unusable in most modules, including MATPRN and ADD.
4. The correspondence between the parameters and the content of a matrix trailer is
as follows:
Parameter Matrix Trailer
P1 Number of columns
P2 Number of rows
P3 Form
P5 Number of nonzero words
For matrices, P4 and P6 must be -1 or unspecified. See Examples 2 and 3.
5. For table trailer contents, see “Data Blocks” in Chapter 2.
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