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1.12 DS NDL1

1.12.1 Contents

This DS describes the degree of freedom numbers corresponding to each node. At the modules level, this information is exploited through function NDL:

NDL(i+1) is the number of the last degree corresponding to node i.

DS NDL1 is different to the other DS. There are three cases possible:

• ND 0, i.e. the number of degrees of freedom per node is constant; we thus have:
  
• ND = 0, i.e. the number of degrees of freedom differ for at least 2 nodes; array NNDL1 (address IANDL in M) is therefore necessary and resides totally in core; we thus have:
  
• array NNDL1 is paginated and stored in secondary memory. Only one page resides in main memory. A particular page, page k, is searched and read, so that:
  
  where NNPSEG is the number of nodes per page.

In practice, DS NDL1 only exists in cases 2 and 3. In order for its existence to be transparent to the user, it is coupled with function LRNDL1. All modules using DS NDL1, needs to, before calling NDL, initialize the process by
[4] .

1.12.2 Corresponding tools

Creation and manipulation modules for DS NDL1

DS NDL1 is created using a DS MAIL by module CONDL1.

      SUBROUTINE CONDL1(M,NNSEG,NFMAIL,NIMAIL,NFNDL1,NINDL1,
     +                  LNOET,NNOMAX,ND,NDLMAX)
C AIM :  CONSTRUCT A DS NDL1