cgttrs.f(3) [centos man page]

cgttrs.f(3)							      LAPACK							       cgttrs.f(3)

NAME

       cgttrs.f -

SYNOPSIS

   Functions/Subroutines
       subroutine cgttrs (TRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB, INFO)
	   CGTTRS

Function/Subroutine Documentation
   subroutine cgttrs (characterTRANS, integerN, integerNRHS, complex, dimension( * )DL, complex, dimension( * )D, complex, dimension( * )DU,
       complex, dimension( * )DU2, integer, dimension( * )IPIV, complex, dimension( ldb, * )B, integerLDB, integerINFO)
       CGTTRS

       Purpose:

	    CGTTRS 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.

       Parameters:
	   TRANS

		     TRANS is CHARACTER*1
		     Specifies the form of the system of equations.
		     = 'N':  A * X = B	   (No transpose)
		     = 'T':  A**T * X = B  (Transpose)
		     = 'C':  A**H * X = B  (Conjugate transpose)

	   N

		     N is INTEGER
		     The order of the matrix A.

	   NRHS

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

	   DL

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

	   D

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

	   DU

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

	   DU2

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

	   IPIV

		     IPIV is 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

		     B is 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

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

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit
		     < 0:  if INFO = -k, the k-th argument had an illegal value

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 138 of file cgttrs.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						       cgttrs.f(3)

Check Out this Related Man Page

CGTTRS(l)								 )								 CGTTRS(l)

NAME

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

SYNOPSIS

       SUBROUTINE CGTTRS( TRANS, N, NRHS, DL, D, DU, DU2, IPIV, B, LDB, INFO )

	   CHARACTER	  TRANS

	   INTEGER	  INFO, LDB, N, NRHS

	   INTEGER	  IPIV( * )

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

PURPOSE

       CGTTRS 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 factoriza-
       tion computed by CGTTRF.

ARGUMENTS

       TRANS   (input) CHARACTER
	       Specifies the form of the system of equations.  = 'N':  A * X = B     (No transpose)
	       = 'T':  A**T * X = B  (Transpose)
	       = 'C':  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.

       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).

       INFO    (output) INTEGER
	       = 0:  successful exit
	       < 0:  if INFO = -k, the k-th argument had an illegal value

LAPACK version 3.0						   15 June 2000 							 CGTTRS(l)

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cgttrs.f(3) [centos man page]

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