ppadd.f
SUBROUTINE PPADD (N, IERROR, A, C, CBP, BP, BH)
C***BEGIN PROLOGUE PPADD
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Warning: this routine is not intended to be user-callable.
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C***SUBSIDIARY
C***PURPOSE Subsidiary to BLKTRI
C***LIBRARY SLATEC
C***TYPE SINGLE PRECISION (PPADD-S)
C***AUTHOR (UNKNOWN)
C***DESCRIPTION
C
C PPADD computes the eigenvalues of the periodic tridiagonal matrix
C with coefficients AN,BN,CN.
C
C N is the order of the BH and BP polynomials.
C BP contains the eigenvalues on output.
C CBP is the same as BP except type complex.
C BH is used to temporarily store the roots of the B HAT polynomial
C which enters through BP.
C
C***SEE ALSO BLKTRI
C***ROUTINES CALLED BSRH, PPSGF, PPSPF, PSGF
C***COMMON BLOCKS CBLKT
C***REVISION HISTORY (YYMMDD)
C 801001 DATE WRITTEN
C 890531 Changed all specific intrinsics to generic. (WRB)
C 891214 Prologue converted to Version 4.0 format. (BAB)
C 900402 Added TYPE section. (WRB)
C***END PROLOGUE PPADD