cgtts2 man page on IRIX

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CGTTS2(3S)							    CGTTS2(3S)

NAME
     CGTTS2 - solve one of the systems of equations A * X = B, A**T * X = B,
     or A**H * X = B,

SYNOPSIS
     SUBROUTINE CGTTS2( ITRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB )

	 INTEGER	ITRANS, LDB, N, NRHS

	 INTEGER	IPIV( * )

	 COMPLEX	B( LDB, * ), D( * ), DL( * ), DU( * ), DU2( * )

IMPLEMENTATION
     These routines are part of the SCSL Scientific Library and can be loaded
     using either the -lscs or the -lscs_mp option.  The -lscs_mp option
     directs the linker to use the multi-processor version of the library.

     When linking to SCSL with -lscs or -lscs_mp, the default integer size is
     4 bytes (32 bits). Another version of SCSL is available in which integers
     are 8 bytes (64 bits).  This version allows the user access to larger
     memory sizes and helps when porting legacy Cray codes.  It can be loaded
     by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
     only one of the two versions; 4-byte integer and 8-byte integer library
     calls cannot be mixed.

PURPOSE
     CGTTS2 solves one of the systems of equations A * X = B, A**T * X = B, or
     A**H * X = B, with a tridiagonal matrix A using the LU factorization
     computed by CGTTRF.

ARGUMENTS
     ITRANS  (input) INTEGER
	     Specifies the form of the system of equations.  = 0:  A * X = B
	     (No transpose)
	     = 1:  A**T * X = B	 (Transpose)
	     = 2:  A**H * X = B	 (Conjugate transpose)

     N	     (input) INTEGER
	     The order of the matrix A.

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

     DL	     (input) COMPLEX array, dimension (N-1)
	     The (n-1) multipliers that define the matrix L from the LU
	     factorization of A.

									Page 1

CGTTS2(3S)							    CGTTS2(3S)

     D	     (input) COMPLEX array, dimension (N)
	     The n diagonal elements of the upper triangular matrix U from the
	     LU factorization of A.

     DU	     (input) COMPLEX array, dimension (N-1)
	     The (n-1) elements of the first super-diagonal of U.

     DU2     (input) COMPLEX array, dimension (N-2)
	     The (n-2) elements of the second super-diagonal of U.

     IPIV    (input) INTEGER array, dimension (N)
	     The pivot indices; for 1 <= i <= n, row i of the matrix was
	     interchanged with row IPIV(i).  IPIV(i) will always be either i
	     or i+1; IPIV(i) = i indicates a row interchange was not required.

     B	     (input/output) COMPLEX array, dimension (LDB,NRHS)
	     On entry, the matrix of right hand side vectors B.	 On exit, B is
	     overwritten by the solution vectors X.

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

SEE ALSO
     INTRO_LAPACK(3S), INTRO_SCSL(3S)

     This man page is available only online.

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