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## slasrt()

subroutine slasrt | ( | character | id,
|  | integer | n,
|  | real, dimension( * ) | d,
|  | integer | info )

SLASRT sorts numbers in increasing or decreasing order.

Download SLASRT + dependencies [TGZ] [ZIP] [TXT]

Purpose:

      !>
      !> Sort the numbers in D in increasing order (if ID = 'I') or
      !> in decreasing order (if ID = 'D' ).
      !>
      !> Use Quick Sort, reverting to Insertion sort on arrays of
      !> size <= 20. Dimension of STACK limits N to about 2**32.
      !>

Parameters

  [in]

  ID

      !>          ID is CHARACTER*1
      !>          = 'I': sort D in increasing order;
      !>          = 'D': sort D in decreasing order.
      !>

  [in]

  N

      !>          N is INTEGER
      !>          The length of the array D.
      !>

  [in,out]

  D

      !>          D is REAL array, dimension (N)
      !>          On entry, the array to be sorted.
      !>          On exit, D has been sorted into increasing order
      !>          (D(1) <= ... <= D(N) ) or into decreasing order
      !>          (D(1) >= ... >= D(N) ), depending on ID.
      !>

  [out]

  INFO

      !>          INFO is INTEGER
      !>          = 0:  successful exit
      !>          < 0:  if INFO = -i, the i-th argument had an illegal value
      !>

Author
  Univ. of Tennessee
  Univ. of California Berkeley
  Univ. of Colorado Denver
  NAG Ltd.