dpperm.f
SUBROUTINE DPPERM (DX, N, IPERM, IER)
C***BEGIN PROLOGUE DPPERM
C***PURPOSE Rearrange a given array according to a prescribed
C permutation vector.
C***LIBRARY SLATEC
C***CATEGORY N8
C***TYPE DOUBLE PRECISION (SPPERM-S, DPPERM-D, IPPERM-I, HPPERM-H)
C***KEYWORDS PERMUTATION, REARRANGEMENT
C***AUTHOR McClain, M. A., (NIST)
C Rhoads, G. S., (NBS)
C***DESCRIPTION
C
C DPPERM rearranges the data vector DX according to the
C permutation IPERM: DX(I) <--- DX(IPERM(I)). IPERM could come
C from one of the sorting routines IPSORT, SPSORT, DPSORT or
C HPSORT.
C
C Description of Parameters
C DX - input/output -- double precision array of values to be
C rearranged.
C N - input -- number of values in double precision array DX.
C IPERM - input -- permutation vector.
C IER - output -- error indicator:
C = 0 if no error,
C = 1 if N is zero or negative,
C = 2 if IPERM is not a valid permutation.
C
C***REFERENCES (NONE)
C***ROUTINES CALLED XERMSG
C***REVISION HISTORY (YYMMDD)
C 901004 DATE WRITTEN
C 920507 Modified by M. McClain to revise prologue text.
C***END PROLOGUE DPPERM