tris4.f
SUBROUTINE TRIS4 (N, A, B, C, D, U, Z)
C***BEGIN PROLOGUE TRIS4
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Warning: this routine is not intended to be user-callable.
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C***SUBSIDIARY
C***PURPOSE Subsidiary to SEPX4
C***LIBRARY SLATEC
C***TYPE SINGLE PRECISION (TRIS4-S)
C***AUTHOR (UNKNOWN)
C***DESCRIPTION
C
C This subroutine solves for a non-zero eigenvector corresponding
C to the zero eigenvalue of the transpose of the rank
C deficient ONE matrix with subdiagonal A, diagonal B, and
C superdiagonal C , with A(1) in the (1,N) position, with
C C(N) in the (N,1) position, AND all other elements zero.
C
C***SEE ALSO SEPX4
C***ROUTINES CALLED (NONE)
C***REVISION HISTORY (YYMMDD)
C 801001 DATE WRITTEN
C 890831 Modified array declarations. (WRB)
C 891214 Prologue converted to Version 4.0 format. (BAB)
C 900402 Added TYPE section. (WRB)
C***END PROLOGUE TRIS4