SLASRT  -  the  numbers  in D in increasing order (if ID =
       'I') or in decreasing order (if ID = 'D' )


SYNOPSIS

       SUBROUTINE SLASRT( ID, N, D, INFO )

           CHARACTER      ID

           INTEGER        INFO, N

           REAL           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) 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.

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


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