DLA_GBRCOND man page on RedHat

Man page or keyword search:  
man Server   29550 pages
apropos Keyword Search (all sections)
Output format
RedHat logo
[printable version]

dla_gbrcond.f(3)		    LAPACK		      dla_gbrcond.f(3)

NAME
       dla_gbrcond.f -

SYNOPSIS
   Functions/Subroutines
       DOUBLE PRECISION function dla_gbrcond (TRANS, N, KL, KU, AB, LDAB, AFB,
	   LDAFB, IPIV, CMODE, C, INFO, WORK, IWORK)
	   DLA_GBRCOND estimates the Skeel condition number for a general
	   banded matrix.

Function/Subroutine Documentation
   DOUBLE PRECISION function dla_gbrcond (characterTRANS, integerN, integerKL,
       integerKU, double precision, dimension( ldab, * )AB, integerLDAB,
       double precision, dimension( ldafb, * )AFB, integerLDAFB, integer,
       dimension( * )IPIV, integerCMODE, double precision, dimension( * )C,
       integerINFO, double precision, dimension( * )WORK, integer, dimension(
       * )IWORK)
       DLA_GBRCOND estimates the Skeel condition number for a general banded
       matrix.

       Purpose:

	       DLA_GBRCOND Estimates the Skeel condition number of  op(A) * op2(C)
	       where op2 is determined by CMODE as follows
	       CMODE =	1    op2(C) = C
	       CMODE =	0    op2(C) = I
	       CMODE = -1    op2(C) = inv(C)
	       The Skeel condition number  cond(A) = norminf( |inv(A)||A| )
	       is computed by computing scaling factors R such that
	       diag(R)*A*op2(C) is row equilibrated and computing the standard
	       infinity-norm condition number.

       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 = Transpose)

	   N

		     N is INTEGER
		The number of linear equations, i.e., the order of the
		matrix A.  N >= 0.

	   KL

		     KL is INTEGER
		The number of subdiagonals within the band of A.  KL >= 0.

	   KU

		     KU is INTEGER
		The number of superdiagonals within the band of A.  KU >= 0.

	   AB

		     AB is DOUBLE PRECISION array, dimension (LDAB,N)
		On entry, the matrix A in band storage, in rows 1 to KL+KU+1.
		The j-th column of A is stored in the j-th column of the
		array AB as follows:
		AB(KU+1+i-j,j) = A(i,j) for max(1,j-KU)<=i<=min(N,j+kl)

	   LDAB

		     LDAB is INTEGER
		The leading dimension of the array AB.	LDAB >= KL+KU+1.

	   AFB

		     AFB is DOUBLE PRECISION array, dimension (LDAFB,N)
		Details of the LU factorization of the band matrix A, as
		computed by DGBTRF.  U is stored as an upper triangular
		band matrix with KL+KU superdiagonals in rows 1 to KL+KU+1,
		and the multipliers used during the factorization are stored
		in rows KL+KU+2 to 2*KL+KU+1.

	   LDAFB

		     LDAFB is INTEGER
		The leading dimension of the array AFB.	 LDAFB >= 2*KL+KU+1.

	   IPIV

		     IPIV is INTEGER array, dimension (N)
		The pivot indices from the factorization A = P*L*U
		as computed by DGBTRF; row i of the matrix was interchanged
		with row IPIV(i).

	   CMODE

		     CMODE is INTEGER
		Determines op2(C) in the formula op(A) * op2(C) as follows:
		CMODE =	 1    op2(C) = C
		CMODE =	 0    op2(C) = I
		CMODE = -1    op2(C) = inv(C)

	   C

		     C is DOUBLE PRECISION array, dimension (N)
		The vector C in the formula op(A) * op2(C).

	   INFO

		     INFO is INTEGER
		  = 0:	Successful exit.
		i > 0:	The ith argument is invalid.

	   WORK

		     WORK is DOUBLE PRECISION array, dimension (5*N).
		Workspace.

	   IWORK

		     IWORK is INTEGER array, dimension (N).
		Workspace.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 169 of file dla_gbrcond.f.

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

Version 3.4.2			Tue Sep 25 2012		      dla_gbrcond.f(3)
[top]

List of man pages available for RedHat

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net