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LEARN ABOUT CENTOS

clanht.f

clanht.f(3)							      LAPACK							       clanht.f(3)

NAME

       clanht.f -

SYNOPSIS

   Functions/Subroutines
       REAL function clanht (NORM, N, D, E)
	   CLANHT returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a
	   complex Hermitian tridiagonal matrix.

Function/Subroutine Documentation
   REAL function clanht (characterNORM, integerN, real, dimension( * )D, complex, dimension( * )E)
       CLANHT returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a complex
       Hermitian tridiagonal matrix.

       Purpose:

	    CLANHT  returns the value of the one norm,	or the Frobenius norm, or
	    the  infinity norm,  or the  element of  largest absolute value  of a
	    complex Hermitian tridiagonal matrix A.

       Returns:
	   CLANHT

	       CLANHT = ( 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 CLANHT as described
		     above.

	   N

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

	   D

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

	   E

		     E is COMPLEX array, dimension (N-1)
		     The (n-1) sub-diagonal or 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 102 of file clanht.f.

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

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

Shell Programming and Scripting