SLATEC Routines --- TRI3 ---

*DECK TRI3
      SUBROUTINE TRI3 (M, A, B, C, K, Y1, Y2, Y3, TCOS, D, W1, W2, W3)
C***BEGIN PROLOGUE  TRI3
C***SUBSIDIARY
C***PURPOSE  Subsidiary to GENBUN
C***LIBRARY   SLATEC
C***TYPE      SINGLE PRECISION (TRI3-S, CMPTR3-C)
C***AUTHOR  (UNKNOWN)
C***DESCRIPTION
C
C     Subroutine to solve three linear systems whose common coefficient
C     matrix is a rational function in the matrix given by
C
C                  TRIDIAGONAL (...,A(I),B(I),C(I),...)
C
C***SEE ALSO  GENBUN
C***ROUTINES CALLED  (NONE)
C***REVISION HISTORY  (YYMMDD)
C   801001  DATE WRITTEN
C   890206  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900402  Added TYPE section.  (WRB)
C***END PROLOGUE  TRI3