program  locate_by_name
      implicit none
C
C     Parameter declaration.
C
      character*7  FILE_NAME
      character*11 SDS_NAME
      character*9  WRONG_NAME
      integer      X_LENGTH, Y_LENGTH
      parameter   (FILE_NAME  = 'SDS.hdf',
     +             SDS_NAME   = 'SDStemplate',
     +             WRONG_NAME = 'WrongName',
     +             X_LENGTH = 5,
     +             Y_LENGTH = 16)
      integer      DFACC_READ, DFNT_INT32
      parameter   (DFACC_READ = 1,
     +             DFNT_INT32 = 24)

C
C     Function declaration.
C
      integer sfstart, sfn2index, sfselect, sfrdata, sfendacc, sfend
C
C**** Variable declaration *******************************************
C 
      integer sd_id, sds_id, sds_index, status
      integer start(2), edges(2), stride(2)
      integer data(X_LENGTH, Y_LENGTH)
      integer j
C
C**** End of variable declaration ************************************
C
C
C     Open the file and initialize the SD interface.
C
      sd_id = sfstart(FILE_NAME, DFACC_READ)
C
C     Find index of the data set with the name specified in WRONG_NAME. 
C     Error condition occurs, since a data set with this name 
C     does not exist in the file.
C
      sds_index = sfn2index(sd_id, WRONG_NAME)
      if (sds_index .eq. -1) then
        write(*,*) "Data set with the name ", WRONG_NAME,
     +             " does not exist"        
      endif
C
C     Find index of the data set with the name specified in SDS_NAME  
C     and use the index to attach to the data set. 
C
      sds_index = sfn2index(sd_id, SDS_NAME)
      sds_id    = sfselect(sd_id, sds_index)
C
C     Set elements of start array to 0, elements of edges array 
C     to SDS dimensions, and elements of stride array to 1 to read entire data. 
C
      start(1) = 0
      start(2) = 0
      edges(1) = X_LENGTH
      edges(2) = Y_LENGTH
      stride(1) = 1
      stride(2) = 1
C
C     Read entire data into array named data. 
C
      status = sfrdata(sds_id, start, stride, edges, data)
C
C     Print 10th column; the following numbers should be displayed:
C
C           10 1000 12 13 14
C
      write(*,*) (data(j,10), j = 1, X_LENGTH)
C
C     Terminate access to the data set. 
C
      status = sfendacc(sds_id)
C
C     Terminate access to the SD interface and close the file.
C
      status = sfend(sd_id)

      end