*
* is_element_of.F
*
*  This software was developed by the Thermal Modeling and Analysis
*  Project(TMAP) of the National Oceanographic and Atmospheric
*  Administration's (NOAA) Pacific Marine Environmental Lab(PMEL),
*  hereafter referred to as NOAA/PMEL/TMAP.
*
*  Access and use of this software shall impose the following
*  obligations and understandings on the user. The user is granted the
*  right, without any fee or cost, to use, copy, modify, alter, enhance
*  and distribute this software, and any derivative works thereof, and
*  its supporting documentation for any purpose whatsoever, provided
*  that this entire notice appears in all copies of the software,
*  derivative works and supporting documentation.  Further, the user
*  agrees to credit NOAA/PMEL/TMAP in any publications that result from
*  the use of this software or in any product that includes this
*  software. The names TMAP, NOAA and/or PMEL, however, may not be used
*  in any advertising or publicity to endorse or promote any products
*  or commercial entity unless specific written permission is obtained
*  from NOAA/PMEL/TMAP. The user also understands that NOAA/PMEL/TMAP
*  is not obligated to provide the user with any support, consulting,
*  training or assistance of any kind with regard to the use, operation
*  and performance of this software nor to provide the user with any
*  updates, revisions, new versions or "bug fixes".
*
*  THIS SOFTWARE IS PROVIDED BY NOAA/PMEL/TMAP "AS IS" AND ANY EXPRESS
*  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
*  ARE DISCLAIMED. IN NO EVENT SHALL NOAA/PMEL/TMAP BE LIABLE FOR ANY SPECIAL,
*  INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
*  RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
*  CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION, ARISING OUT OF OR IN
*  CONNECTION WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE. 
*
* Ansley Manke
* March 2003
*
*  Return logical value (integer 1 or 0); If argument 1 takes on any of 
*  the values of the second argument, return 1, else 0.

*
*
* In this subroutine we provide information about
* the function.  The user configurable information 
* consists of the following:
*
* descr              Text description of the function
*
* num_args           Required number of arguments
*
* axis_inheritance   Type of axis for the result
*                       ( CUSTOM, IMPLIED_BY_ARGS, NORMAL, ABSTRACT )
*                       CUSTOM          - user defined axis
*                       IMPLIED_BY_ARGS - same axis as the incoming argument
*                       NORMAL          - the result is normal to this axis
*                       ABSTRACT        - an axis which only has index values
*
* piecemeal_ok       For memory optimization:
*                       axes where calculation may be performed piecemeal
*                       ( YES, NO )
* 
*
* For each argument we provide the following information:
*
* name               Text name for an argument
*
* unit               Text units for an argument
*
* desc               Text description of an argument
*
* axis_influence     Are this argument's axes the same as the result grid?
*                       ( YES, NO )
*
* axis_extend       How much does Ferret need to extend arg limits relative to result 
*


      SUBROUTINE is_element_of_init(id)

      INCLUDE 'ferret_cmn/EF_Util.cmn'

      INTEGER id, arg

***********************************************************************
*                                           USER CONFIGURABLE PORTION |
*                                                                     |
*                                                                     V
      CHARACTER*100 fcn_desc
      WRITE (fcn_desc, 10)
   10 FORMAT ('Returns 1 if first argument contains any of the ',
     .        'values in argument 2, else 0')
      CALL ef_set_desc(id, fcn_desc)

      CALL ef_set_num_args(id, 2)
      CALL ef_set_has_vari_args(id, NO)
      CALL ef_set_axis_inheritance(id, ABSTRACT, 
     .     NORMAL, NORMAL, NORMAL)

      CALL ef_set_piecemeal_ok(id, NO, NO, NO, NO)

      arg = 1
      CALL ef_set_arg_name(id, arg, 'VAR')
      CALL ef_set_arg_desc(id, arg, 'data to test')
      CALL ef_set_axis_influence(id, arg, NO, NO, NO, NO)

      arg = 2
      CALL ef_set_arg_name(id, arg, 'VALUES')
      CALL ef_set_arg_desc(id, arg, 'values to search for')
      CALL ef_set_axis_influence(id, arg, NO, NO, NO, NO)

*                                                                     ^
*                                                                     |
*                                           USER CONFIGURABLE PORTION |
***********************************************************************

      RETURN 
      END

*
* In this subroutine we provide information about the lo and hi
* limits associated with each abstract or custom axis.   The user 
* configurable information consists of the following:
*
* lo_ss               lo subscript for an axis
*
* hi_ss               hi subscript for an axis
*

      SUBROUTINE is_element_of_result_limits(id)

      INCLUDE 'ferret_cmn/EF_Util.cmn'
      INCLUDE 'ferret_cmn/EF_mem_subsc.cmn'

      INTEGER id

* **********************************************************************
*                                           USER CONFIGURABLE PORTION |
*                                                                     |
*                                                                     V
      INTEGER my_lo_l, my_hi_l

*
*     Use utility functions to get context information about the arguments.
*     Set the abstract X axis.
*

      my_lo_l = 1
      my_hi_l = 1
      CALL ef_set_axis_limits(id, X_AXIS, my_lo_l, my_hi_l)

*                                                                     ^
*                                                                     |
*                                           USER CONFIGURABLE PORTION |
* **********************************************************************

      RETURN 
      END


*
* In this subroutine we compute the result
*
      SUBROUTINE is_element_of_compute(id, arg_1, arg_2, result)

      INCLUDE 'ferret_cmn/EF_Util.cmn'
      INCLUDE 'ferret_cmn/EF_mem_subsc.cmn'

      REAL bad_flag(EF_MAX_ARGS), bad_flag_result
      REAL arg_1(mem1lox:mem1hix, mem1loy:mem1hiy, mem1loz:mem1hiz, 
     .     mem1lot:mem1hit)
      REAL arg_2(mem2lox:mem2hix, mem2loy:mem2hiy, mem2loz:mem2hiz, 
     .     mem2lot:mem2hit)
     .     
      REAL result(memreslox:memreshix, memresloy:memreshiy,
     .      memresloz:memreshiz, memreslot:memreshit)

* After initialization, the 'res_' arrays contain indexing information 
* for the result axes.  The 'arg_' arrays will contain the indexing 
* information for each variable's axes. 

      INTEGER res_lo_ss(4), res_hi_ss(4), res_incr(4)
      INTEGER arg_lo_ss(4,EF_MAX_ARGS), arg_hi_ss(4,EF_MAX_ARGS),
     .     arg_incr(4,EF_MAX_ARGS)


***********************************************************************
*                                           USER CONFIGURABLE PORTION |
*                                                                     |
*                                                                     V
      INTEGER id
      INTEGER i, j, k, l
      INTEGER i1, j1, k1, l1
      INTEGER i2, j2, k2, l2

      CALL ef_get_res_subscripts(id, res_lo_ss, res_hi_ss, res_incr)
      CALL ef_get_arg_subscripts(id, arg_lo_ss, arg_hi_ss, arg_incr)
      CALL ef_get_bad_flags(id, bad_flag, bad_flag_result)

C  Check for values matching arg2

      i = res_lo_ss(X_AXIS)
      j = res_lo_ss(Y_AXIS)
      k = res_lo_ss(Z_AXIS)
      l = res_lo_ss(T_AXIS)

      result(i,j,k,l) = 0.

      DO 400 i2=arg_lo_ss(X_AXIS,ARG2), arg_hi_ss(X_AXIS, ARG2)
      DO 300 j2=arg_lo_ss(Y_AXIS,ARG2), arg_hi_ss(Y_AXIS, ARG2)
      DO 200 k2=arg_lo_ss(Z_AXIS,ARG2), arg_hi_ss(Z_AXIS, ARG2)
      DO 100 l2=arg_lo_ss(T_AXIS,ARG2), arg_hi_ss(T_AXIS, ARG2)

         DO 410 i1=arg_lo_ss(X_AXIS,ARG1), arg_hi_ss(X_AXIS, ARG1)
         DO 310 j1=arg_lo_ss(Y_AXIS,ARG1), arg_hi_ss(Y_AXIS, ARG1)
         DO 210 k1=arg_lo_ss(Z_AXIS,ARG1), arg_hi_ss(Z_AXIS, ARG1)
         DO 110 l1=arg_lo_ss(T_AXIS,ARG1), arg_hi_ss(T_AXIS, ARG1)

            IF ( arg_1(i1,j1,k1,l1) .NE. bad_flag(1) .AND.
     .           arg_2(i2,j2,k2,l2) .NE. bad_flag(2)) THEN

               IF (arg_1(i1,j1,k1,l1) .EQ. arg_2(i2,j2,k2,l2) ) THEN
                  result(i,j,k,l) = 1.
                  GO TO 9000
               ENDIF
            ENDIF

 110     CONTINUE
 210     CONTINUE
 310     CONTINUE
 410     CONTINUE

 100  CONTINUE
 200  CONTINUE
 300  CONTINUE
 400  CONTINUE
      
9000  RETURN

      END
*                                                                     ^
*                                                                     |
*                                           USER CONFIGURABLE PORTION |
***********************************************************************
