ZLANGE  -  return the value of the one norm, or the Frobe­
       nius norm, or the infinity norm, or the element of largest
       absolute value of a complex matrix A


SYNOPSIS

       DOUBLE PRECISION FUNCTION ZLANGE( NORM, M, N, A, LDA, WORK
                        )

           CHARACTER    NORM

           INTEGER      LDA, M, N

           DOUBLE       PRECISION WORK( * )

           COMPLEX*16   A( LDA, * )


PURPOSE

       ZLANGE 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 matrix A.


DESCRIPTION

       ZLANGE returns the value

          ZLANGE = ( 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  Frobe­
       nius 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 ZLANGE as
               described above.

       M       (input) INTEGER
               The number of rows of the matrix A.  M >= 0.  When
               M = 0, ZLANGE is set to zero.

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

               The m by n matrix A.

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

       WORK    (workspace) DOUBLE PRECISION array, dimension
               (LWORK),
               where LWORK >= M when NORM = 'I'; otherwise,  WORK
               is not referenced.


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