CLANSP man page on Oracle

clansp.f(3)			    LAPACK			   clansp.f(3)

NAME
clansp.f -

SYNOPSIS
Functions/Subroutines
REAL function clansp (NORM, UPLO, N, AP, WORK)
CLANSP returns the value of the 1-norm, or the Frobenius norm, or
the infinity norm, or the element of largest absolute value of a
symmetric matrix supplied in packed form.

Function/Subroutine Documentation
REAL function clansp (characterNORM, characterUPLO, integerN, complex,
dimension( * )AP, real, dimension( * )WORK)
CLANSP returns the value of the 1-norm, or the Frobenius norm, or the
infinity norm, or the element of largest absolute value of a symmetric
matrix supplied in packed form.

Purpose:

CLANSP  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 symmetric matrix A,	 supplied in packed form.

Returns:
CLANSP

CLANSP = ( 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.

Parameters:
NORM

NORM is CHARACTER*1
Specifies the value to be returned in CLANSP as described
above.

UPLO

UPLO is CHARACTER*1
Specifies whether the upper or lower triangular part of the
symmetric matrix A is supplied.
= 'U':  Upper triangular part of A is supplied
= 'L':  Lower triangular part of A is supplied

N

N is INTEGER
The order of the matrix A.	 N >= 0.  When N = 0, CLANSP is
set to zero.

AP

AP is COMPLEX array, dimension (N*(N+1)/2)
The upper or lower triangle of the symmetric matrix A, packed
columnwise in a linear array.  The j-th column of A is stored
in the array AP as follows:
if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.

WORK

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

Author:
Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:
September 2012

Definition at line 116 of file clansp.f.

Author
Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2			Tue Sep 25 2012			   clansp.f(3)
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