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LAPACK version 3.0
slansy(3)

PURPOSE
  SLANSY - 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
  matrix A

SYNTAX
  REAL FUNCTION SLANSY( NORM, UPLO, N, A, LDA, WORK )

      CHARACTER NORM, UPLO

      INTEGER	LDA, N

      REAL	A( LDA, * ), WORK( * )

DESCRIPTION
  SLANSY 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
  matrix A.

DESCRIPTION
  SLANSY returns the value

     SLANSY = ( 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 SLANSY as described above.

  UPLO	  (input) CHARACTER*1
	  Specifies whether the upper or lower triangular part of the
	  symmetric matrix A is to be referenced.  = 'U':  Upper triangular
	  part of A is referenced
	  = 'L':  Lower triangular part of A is referenced

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

  A	  (input) REAL array, dimension (LDA,N)
	  The symmetric matrix A.  If UPLO = 'U', the leading n by n upper
	  triangular part of A contains the upper triangular part of the
	  matrix A, and the strictly lower triangular part of A is not
	  referenced.  If UPLO = 'L', the leading n by n lower triangular
	  part of A contains the lower triangular part of the matrix A, and
	  the strictly upper triangular part of A is not referenced.

  LDA	  (input) INTEGER
	  The leading dimension of the array A.	 LDA >= max(N,1).

  WORK	  (workspace) REAL array, dimension (LWORK),
	  where LWORK >= N when NORM = 'I' or '1' or 'O'; otherwise, WORK is
	  not referenced.