cpttrs.f man page on Oracle

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cpttrs.f(3)			    LAPACK			   cpttrs.f(3)

       cpttrs.f -

       subroutine cpttrs (UPLO, N, NRHS, D, E, B, LDB, INFO)

Function/Subroutine Documentation
   subroutine cpttrs (characterUPLO, integerN, integerNRHS, real, dimension( *
       )D, complex, dimension( * )E, complex, dimension( ldb, * )B,
       integerLDB, integerINFO)


	    CPTTRS solves a tridiagonal system of the form
	       A * X = B
	    using the factorization A = U**H*D*U or A = L*D*L**H computed by CPTTRF.
	    D is a diagonal matrix specified in the vector D, U (or L) is a unit
	    bidiagonal matrix whose superdiagonal (subdiagonal) is specified in
	    the vector E, and X and B are N by NRHS matrices.


		     UPLO is CHARACTER*1
		     Specifies the form of the factorization and whether the
		     vector E is the superdiagonal of the upper bidiagonal factor
		     U or the subdiagonal of the lower bidiagonal factor L.
		     = 'U':  A = U**H*D*U, E is the superdiagonal of U
		     = 'L':  A = L*D*L**H, E is the subdiagonal of L


		     N is INTEGER
		     The order of the tridiagonal matrix A.  N >= 0.


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


		     D is REAL array, dimension (N)
		     The n diagonal elements of the diagonal matrix D from the
		     factorization A = U**H*D*U or A = L*D*L**H.


		     E is COMPLEX array, dimension (N-1)
		     If UPLO = 'U', the (n-1) superdiagonal elements of the unit
		     bidiagonal factor U from the factorization A = U**H*D*U.
		     If UPLO = 'L', the (n-1) subdiagonal elements of the unit
		     bidiagonal factor L from the factorization A = L*D*L**H.


		     B is REAL array, dimension (LDB,NRHS)
		     On entry, the right hand side vectors B for the system of
		     linear equations.
		     On exit, the solution vectors, X.


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


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

	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

	   September 2012

       Definition at line 122 of file cpttrs.f.

       Generated automatically by Doxygen for LAPACK from the source code.

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

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