Provided by: liblapack-doc_3.3.1-1_all bug

NAME

       LAPACK-3 - returns the value of the one norm, or the Frobenius norm, or the infinity norm,
       or the element of largest absolute value of a Hessenberg matrix A

SYNOPSIS

       REAL FUNCTION CLANHS( NORM, N, A, LDA, WORK )

           CHARACTER NORM

           INTEGER   LDA, N

           REAL      WORK( * )

           COMPLEX   A( LDA, * )

PURPOSE

       CLANHS  returns the value of the one norm,  or the Frobenius norm, or the  infinity  norm,
       or the  element of  largest absolute value  of a Hessenberg matrix A.

DESCRIPTION

        CLANHS returns the value
           CLANHS = ( 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.

ARGUMENTS

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

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

        A       (input) COMPLEX array, dimension (LDA,N)
                The n by n upper Hessenberg matrix A; the part of A below the
                first sub-diagonal is not referenced.

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

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

 LAPACK auxiliary routine (version 3.2)     April 2011                            CLANHS(3lapack)