debian man page for dlasrt2

DLASRT2(l)						   LAPACK routine (version 1.5) 						DLASRT2(l)

NAME
       DLASRT2 - the numbers in D in increasing order (if ID = 'I') or in decreasing order (if ID = 'D' )

SYNOPSIS
       SUBROUTINE DLASRT2( ID, N, D, KEY, INFO )

	   CHARACTER	   ID

	   INTEGER	   INFO, N

	   INTEGER	   KEY( * )

	   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.

       KEY     (input/output) INTEGER array, dimension (N)
	       On entry, KEY contains a key to each of the entries in D() Typically, KEY(I) = I for all I On exit, KEY is permuted in exactly  the
	       same manner as D() was permuted from input to output 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

LAPACK version 1.5						    12 May 1997 							DLASRT2(l)