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SLANST(3F)							    SLANST(3F)

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.

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