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RedHat 9 (Linux i386) - man page for slanst (redhat section l)

SLANST(l)					)					SLANST(l)

NAME
       SLANST - return the value of the one norm, or the Frobenius norm, or the infinity norm, or
       the element of largest absolute value of a real symmetric tridiagonal matrix A

SYNOPSIS
       REAL FUNCTION SLANST( NORM, N, D, E )

	   CHARACTER NORM

	   INTEGER   N

	   REAL      D( * ), E( * )

PURPOSE
       SLANST 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 symmetric tridiagonal matrix A.

DESCRIPTION
       SLANST returns the value

	  SLANST = ( 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  matrix
       norm.

ARGUMENTS
       NORM    (input) CHARACTER*1
	       Specifies the value to be returned in SLANST as described above.

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.  When N = 0, SLANST is set to zero.

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

       E       (input) REAL array, dimension (N-1)
	       The (n-1) sub-diagonal or super-diagonal elements of A.

LAPACK version 3.0			   15 June 2000 				SLANST(l)


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