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C Library Functions  - unique (3)

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NAME

unique(3f) - [M_sort] return array with adjacent duplicate values removed (LICENSE:PD)

CONTENTS

Synopsis
Description
Options
Examples

SYNOPSIS

subroutine unique(array,ivals)

    class(*),intent(inout)  :: array(:)
    integer,intent(out)     :: ivals

DESCRIPTION

Assuming an array is sorted, return the array with adjacent duplicate values removed.

If the input array is sorted, this will produce a list of unique values.

OPTIONS

array	may be of type INTEGER, REAL, CHARACTER, COMPLEX, DOUBLEPRECISION, or COMPLEX(KIND=KIND(0.0d0)).
ivals	returned number of unique values packed into beginning of array

EXAMPLES

Sample program

      program demo_unique
      use M_sort, only : unique
      implicit none
      character(len=:),allocatable :: strings(:)
      integer,allocatable :: ints(:)
      integer :: icount
      integer :: ilong

      strings=[character(len=20) :: ’orange’,’green’,’green’, &
      & ’red’,’white’,’blue’,’yellow’,’blue’,’magenta’,’cyan’,’black’]
      ints=[30,1,1,2,3,4,4,-10,20,20,30,3]
      ilong=maxval(len_trim(strings))

      write(*,’(a,*(a,1x))’)’ORIGINAL:’,strings(:)(:ilong)
      write(*,’("SIZE=",i0)’)size(strings)
      call unique(strings,icount)
      write(*,*)
      write(*,’(a,*(a,1x))’)’AFTER   :’,strings(1:icount)(:ilong)
      write(*,’("SIZE=",i0)’)size(strings)
      write(*,’("ICOUNT=",i0)’)icount

      write(*,’(a,*(g0,1x))’)’ORIGINAL:’,ints
      write(*,’("SIZE=",i0)’)size(ints)
      call unique(ints,icount)
      write(*,*)
      write(*,’(a,*(g0,1x))’)’AFTER   :’,ints(1:icount)
      write(*,’("SIZE=",i0)’)size(ints)
      write(*,’("ICOUNT=",i0)’)icount

      end program demo_unique

Expected output

   ORIGINAL:orange  green   green   red     white   blue
   yellow  blue    magenta cyan    black
   SIZE=11

   AFTER   :orange  green   red     white   blue    yellow
   blue    magenta cyan    black
   SIZE=11
   ICOUNT=10

   ORIGINAL:30 1 1 2 3 4 4 -10 20 20 30 3
   SIZE=12

   AFTER   :30 1 2 3 4 -10 20 30 3
   SIZE=12
   ICOUNT=8

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Nemo Release 3.1

unique (3)

February 23, 2025

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