The following is an example of how to retrieve the nodes of an element and obtain the nodal values, using a user subroutine EXEDIT. The example calculates and stores the average z-coordinate of an element as the average z-location of its nodes.

The local variable arrays RVL and IVL are used for the storage of element variables as well as nodal variables. This routine highlights that a call to get_node_var in the internal loop over the eight nodes of the element overwrites/replaces the element values in the RVL array by nodal values. In order to store the time and average element z-location a new call to get_element_var is required first to retrieve the element variables in the RVL array again before a call to put_elem_var can store the new values in permanent element storage.

      SUBROUTINE EXEDIT3

      USE kindef
      USE wrapup
      USE mdpart
      USE mdvar_all
      USE cycvar
      USE mdgrid3
      USE mdsolv
      USE cycvar
      USE mdstring
      
      IMPLICIT NONE

      ! ************************************************************************

      ! THIS IS A USER SUPPLIED SUBROUTINE WHICH CAN BE USED TO PROVIDE
      ! SPECIAL CUSTOM EDITING. THE FREQUENCY AT WHICH THIS SUBROUTINE
      ! IS CALLED IS DEFINED THROUGH INPUT (GLOBAL-EDIT-USER). WHEN
      ! REQUESTED, IT IS CALLED BY THE EDIT PROCESSOR AT THE END OF A
      ! COMPUTATIONAL CYCLE. THE ROUTINE IS CALLED BEFORE ANY OTHER
      ! TYPES OF STANDARD EDITS ARE CALLED FOR THAT CYCLE (EG. PRINT,
      ! SAVE, HISTORY, DISPLAY, ETC), SO IT MAY ALSO BE USED TO SET UP
      ! DATA TO BE PROCESSED BY OTHER EDIT TYPES.

      ! ************************************************************************

      INTEGER (INT4) :: NP, NE, NENUM, INTPOI, ELTYPE, I
      INTEGER (INT4), DIMENSION(8) :: NODENM
      REAL (REAL8), DIMENSION(8) :: NODE_Z_VALUE
      REAL (REAL8) :: ELEMENT_Z_VALUE

        DO NP = 1, NUM_PARTS
          DO NE = 1, PARTS(NP)%P%NUMELM
            NENUM = PARTS(NP)%P%ELEMENT_LIST(NE)
            INTPOI = 0
            CALL GET_ELEM_VAR(NENUM,INTPOI)
            ELTYPE = DATA_STR(NSTRING)%P%OPT(EL_SOPT_ELEMTYPE)
            if(ELTYPE == ELTYPE_HEX8) then
              NODENM(1) = IVL(IVI_CON1)
              NODENM(2) = IVL(IVI_CON2)
              NODENM(3) = IVL(IVI_CON3)
              NODENM(4) = IVL(IVI_CON4)  
              NODENM(5) = IVL(IVI_CON5)
              NODENM(6) = IVL(IVI_CON6)
              NODENM(7) = IVL(IVI_CON7)
              NODENM(8) = IVL(IVI_CON8) 
              DO I=1,8
                CALL GET_NODE_VAR(NODENM(I),0)   
                NODE_Z_VALUE(I) = RVL(IVR_Z)
              END DO
              ELEMENT_Z_VALUE = SUM(NODE_Z_VALUE)/8.0 
              CALL GET_ELEM_VAR(NENUM,INTPOI)
              RVL(IVR_VAR01) = TIME
              RVL(IVR_VAR02) = ELEMENT_Z_VALUE
            end if
            CALL PUT_ELEM_VAR(NENUM,INTPOI)
          END DO
        END DO
        
      RETURN

      END SUBROUTINE EXEDIT3