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Man Pages


Manual Reference Pages  -  DLASRT2 (l)

NAME

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

CONTENTS

Synopsis
Purpose
Arguments

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
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ScaLAPACK version 1.7 DLASRT2 (l) 13 August 2001

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