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dlasrt examples
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Man Page Details
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NAME
       DLASRT - number in D in increasing order (if ID = 'I') or in decreasing
       order (if ID = 'D' )

SYNOPSIS
       SUBROUTINE DLASRT( ID, N, D, INFO )

           CHARACTER      ID

           INTEGER        INFO, N

           DOUBLE         PRECISION D( * )

  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.

  Arguments
  =========

  ID      (input) CHARACTER*1
          = 'I': sort D in increasing order;
          = 'D': sort D in decreasing order.

  N       (input) INTEGER
          The length of the array D.

  D       (input/output) DOUBLE PRECISION 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.

  INFO    (output) INTEGER
          = 0:  successful exit
          < 0:  if INFO = -i, the i-th argument had an illegal value

