NEC-LIST - APPARENT NEC4.1 CODE LIMITATION (MAXSEG=10000)

     While attempting to run NEC4.1 using a very large input model
     (13,976 wire segments with 4-fold rotational symmetry), I
     received the following error message:
     
     JNFIND: ERROR AT -1 END OF SEGMENT 1
     MULTIPLE WIRE JUNCTION AT CONNECTION TO SURFACE PATCH IS NOT ALLOWED
     
     which seemed very strange since my model did not include any
     surface patches.
     
     After briefly reviewing the source code, I noticed that the
     number 10000 appears in several places. My guess is that the
     number 10000 is being used as a flag under the assumption that
     the number of segments would never be this large.
     
     Based on my limited knowledge of the code logic, I made a backup
     copy of nec4d.f and changed all occurrences of the number 10000
     to 20000. I set MAXSEG=32000 and MAXMAT=7200 in NECPAR.INC. With
     4-fold rotational symmetry, the amount of RAM required to run the
     executable should be < 1 GB. I recompiled and started the run on
     an Ultra Sparc with 1 GByte of RAM. Based on previous smaller
     runs on the same machine, it should take about 10 hours to
     run. I'm afraid I may get bad results because I changed something
     in the code that I shouldn't have.
     
     My question is, how do you modify the code to allow for more than
     10000 model segments without introducing any errors into the code?
Received on Tue Aug 19 1997 - 22:52:40 EDT