# spperm.f

          SUBROUTINE SPPERM (X, N, IPERM, IER)
    C***BEGIN PROLOGUE  SPPERM
    C***PURPOSE  Rearrange a given array according to a prescribed
    C            permutation vector.
    C***LIBRARY   SLATEC
    C***CATEGORY  N8
    C***TYPE      SINGLE PRECISION (SPPERM-S, DPPERM-D, IPPERM-I, HPPERM-H)
    C***KEYWORDS  APPLICATION OF PERMUTATION TO DATA VECTOR
    C***AUTHOR  McClain, M. A., (NIST)
    C           Rhoads, G. S., (NBS)
    C***DESCRIPTION
    C
    C         SPPERM rearranges the data vector X according to the
    C         permutation IPERM: X(I) <--- X(IPERM(I)).  IPERM could come
    C         from one of the sorting routines IPSORT, SPSORT, DPSORT or
    C         HPSORT.
    C
    C     Description of Parameters
    C         X - input/output -- real array of values to be rearranged.
    C         N - input -- number of values in real array X.
    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  SPPERM