NAME

dlasrt - the numbers 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

SunSoft, Inc.  —  Last change: 27 Jun 1995