cgtsv man page on IRIX

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CGTSV(3F)							     CGTSV(3F)

NAME
     CGTSV - solve the equation	  A*X = B,

SYNOPSIS
     SUBROUTINE CGTSV( N, NRHS, DL, D, DU, B, LDB, INFO )

	 INTEGER       INFO, LDB, N, NRHS

	 COMPLEX       B( LDB, * ), D( * ), DL( * ), DU( * )

PURPOSE
     CGTSV  solves the equation

     where A is an N-by-N tridiagonal matrix, by Gaussian elimination with
     partial pivoting.

     Note that the equation  A'*X = B  may be solved by interchanging the
     order of the arguments DU and DL.

ARGUMENTS
     N	     (input) INTEGER
	     The order of the matrix A.	 N >= 0.

     NRHS    (input) INTEGER
	     The number of right hand sides, i.e., the number of columns of
	     the matrix B.  NRHS >= 0.

     DL	     (input/output) COMPLEX array, dimension (N-1)
	     On entry, DL must contain the (n-1) subdiagonal elements of A.
	     On exit, DL is overwritten by the (n-2) elements of the second
	     superdiagonal of the upper triangular matrix U from the LU
	     factorization of A, in DL(1), ..., DL(n-2).

     D	     (input/output) COMPLEX array, dimension (N)
	     On entry, D must contain the diagonal elements of A.  On exit, D
	     is overwritten by the n diagonal elements of U.

     DU	     (input/output) COMPLEX array, dimension (N-1)
	     On entry, DU must contain the (n-1) superdiagonal elements of A.
	     On exit, DU is overwritten by the (n-1) elements of the first
	     superdiagonal of U.

     B	     (input/output) COMPLEX array, dimension (LDB,NRHS)
	     On entry, the N-by-NRHS right hand side matrix B.	On exit, if
	     INFO = 0, the N-by-NRHS solution matrix X.

     LDB     (input) INTEGER
	     The leading dimension of the array B.  LDB >= max(1,N).

									Page 1

CGTSV(3F)							     CGTSV(3F)

     INFO    (output) INTEGER
	     = 0:  successful exit
	     < 0:  if INFO = -i, the i-th argument had an illegal value
	     > 0:  if INFO = i, U(i,i) is exactly zero, and the solution has
	     not been computed.	 The factorization has not been completed
	     unless i = N.

									Page 2

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