README file for the run0a.alt alter package

1. INTRODUCTION.  

The purpose of this alter is to prepare a NASTRAN database for fast
restarts in Interactive Dynamics usage.  It applies to SOLs 103, 111,
and 112, and may be used on cold starts or restarts.  Fast restarts
require the use of the fstrsta.alt alter package, described in its own
readme file.

2. INPUT

Place " include 'run0a.alt' " before the CEND entry.  No other input
is required.  When used from PATRAN, this alter is automatically
inserted after hitting the Interactive NASTRAN Preparation button.  Run
scr=no so that a data base remains after the run.

3. OUTPUT

None.

4. FUNCTION

The alter prepares the data blocks needed for read-only operations on
the fast restart.  The most costly operation is transposing the
eigenvector matrix, which typically adds one percent to the total
runtime of a cold start.  

5. LIMITATIONS

The fast restarts have many limitations, as described in their readme
file.  The only limitation of this alter is it will not function if the
DDRMM method is blocked by the presence of param, ddrmm, -1.  If you
have needs for the non-DDRMM method (called the mode displacement
method) do a restart of that database in SOL 103 with the alter
requested.

6. TEST PROBLEMS

See run01.dat.  Must be run with scr=no to save the database after the
run.  This is a SOL 111 run, with the same loads as the fstrst1.dat
file.  It provides check answers for the fstrst1 file.