dlansy man page on Scientific

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```DLANSY(1)	    LAPACK auxiliary routine (version 3.2)	     DLANSY(1)

NAME
DLANSY  -  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

SYNOPSIS
DOUBLE PRECISION FUNCTION DLANSY( NORM, UPLO, N, A, LDA, WORK )

CHARACTER	NORM, UPLO

INTEGER	LDA, N

DOUBLE	PRECISION A( LDA, * ), WORK( * )

PURPOSE
DLANSY	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
DLANSY returns the value
DLANSY = ( 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	 DLANSY	 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 triangu‐
lar 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, DLANSY is set
to zero.

A       (input) DOUBLE PRECISION 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 trian‐
gular 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) DOUBLE PRECISION array, dimension (MAX(1,LWORK)),
where LWORK >= N when NORM = 'I' or '1' or 'O'; otherwise, WORK
is not referenced.

LAPACK auxiliary routine (versioNovember 2008			     DLANSY(1)
```
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