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CentOS 7.0 - man page for dlangt (centos section 3)

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dlangt.f(3)				      LAPACK				      dlangt.f(3)

NAME
       dlangt.f -

SYNOPSIS
   Functions/Subroutines
       DOUBLE PRECISION function dlangt (NORM, N, DL, D, DU)
	   DLANGT returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest
	   absolute value of any element of a general tridiagonal matrix.

Function/Subroutine Documentation
   DOUBLE PRECISION function dlangt (characterNORM, integerN, double precision, dimension( * )DL,
       double precision, dimension( * )D, double precision, dimension( * )DU)
       DLANGT returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest
       absolute value of any element of a general tridiagonal matrix.

       Purpose:

	    DLANGT  returns the value of the one norm,	or the Frobenius norm, or
	    the  infinity norm,  or the  element of  largest absolute value  of a
	    real tridiagonal matrix A.

       Returns:
	   DLANGT

	       DLANGT = ( max(abs(A(i,j))), NORM = 'M' or 'm'
			(
			( norm1(A),	    NORM = '1', 'O' or 'o'
			(
			( normI(A),	    NORM = 'I' or 'i'
			(
			( normF(A),	    NORM = 'F', 'f', 'E' or 'e'

	    where  norm1  denotes the  one norm of a matrix (maximum column sum),
	    normI  denotes the	infinity norm  of a matrix  (maximum row sum) and
	    normF  denotes the	Frobenius norm of a matrix (square root of sum of
	    squares).  Note that  max(abs(A(i,j)))  is not a consistent matrix norm.

       Parameters:
	   NORM

		     NORM is CHARACTER*1
		     Specifies the value to be returned in DLANGT as described
		     above.

	   N

		     N is INTEGER
		     The order of the matrix A.  N >= 0.  When N = 0, DLANGT is
		     set to zero.

	   DL

		     DL is DOUBLE PRECISION array, dimension (N-1)
		     The (n-1) sub-diagonal elements of A.

	   D

		     D is DOUBLE PRECISION array, dimension (N)
		     The diagonal elements of A.

	   DU

		     DU is DOUBLE PRECISION array, dimension (N-1)
		     The (n-1) super-diagonal elements of A.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 107 of file dlangt.f.

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

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