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DLASRT2

DLASRT2

Section: LAPACK routine (version 1.5) (l) Updated: 12 May 1997
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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


 

Index

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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Time: 21:45:07 GMT, April 16, 2011