SLASRT2(3)    ScaLAPACK routine of NEC Numeric Library Collection   SLASRT2(3)



NAME
       SLASRT2  -  the  numbers  in  D in increasing order (if ID = 'I') or in
       decreasing order (if ID = 'D' )

SYNOPSIS
       SUBROUTINE SLASRT2( ID, N, D, KEY, INFO )

           CHARACTER       ID

           INTEGER         INFO, N

           INTEGER         KEY( * )

           REAL            D( * )

PURPOSE
       Sort the numbers in D in increasing order (if ID = 'I') or in  decreas-
       ing  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.

       KEY     (input/output) INTEGER array, dimension (N)
               On entry, KEY contains a key to each of the entries in D() Typ-
               ically,  KEY(I)  =  I  for  all  I  On exit, KEY is permuted in
               exactly the same manner as D() was permuted from input to  out-
               put  Therefore,  if  KEY(I)  =  I  for  all  I upon input, then
               D_out(I) = D_in(KEY(I))

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



ScaLAPACK routine               31 October 2017                     SLASRT2(3)