NAME

lasrt - lasrt: sort vector

SYNOPSIS

Functions

subroutine dlasrt (id, n, d, info)
DLASRT sorts numbers in increasing or decreasing order. subroutine slasrt (id, n, d, info)
SLASRT sorts numbers in increasing or decreasing order.

Detailed Description

Function Documentation

subroutine dlasrt (character id, integer n, double precision, dimension( * ) d, integer info)

DLASRT sorts numbers in increasing or decreasing order.

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.

Parameters



          ID is CHARACTER*1


          = 'I': sort D in increasing order;


          = 'D': sort D in decreasing order.



          N is INTEGER


          The length of the array D.



          D is 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



          INFO is INTEGER


          = 0:  successful exit


          < 0:  if INFO = -i, the i-th argument had an illegal value

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 87 of file dlasrt.f.

subroutine slasrt (character id, integer n, real, dimension( * ) d, integer info)

SLASRT sorts numbers in increasing or decreasing order.