CLANGE man page on IRIX

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CLANGE(3F)							    CLANGE(3F)

NAME
     CLANGE - return 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

SYNOPSIS
     REAL FUNCTION CLANGE( NORM, M, N, A, LDA, WORK )

	 CHARACTER NORM

	 INTEGER   LDA, M, N

	 REAL	   WORK( * )

	 COMPLEX   A( LDA, * )

PURPOSE
     CLANGE  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
     CLANGE returns the value

	CLANGE = ( 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 CLANGE as described above.

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

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

									Page 1

CLANGE(3F)							    CLANGE(3F)

     A	     (input) COMPLEX array, dimension (LDA,N)
	     The m by n matrix A.

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

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

									Page 2

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