dlanst (3)  Linux Man Pages
NAME
dlanst.f 
SYNOPSIS
Functions/Subroutines
DOUBLE PRECISION function dlanst (NORM, N, D, E)
DLANST returns the value of the 1norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real symmetric tridiagonal matrix.
Function/Subroutine Documentation
DOUBLE PRECISION function dlanst (characterNORM, integerN, double precision, dimension( * )D, double precision, dimension( * )E)
DLANST returns the value of the 1norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real symmetric tridiagonal matrix.
Purpose:

DLANST 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 tridiagonal matrix A.
Returns:

DLANST
DLANST = ( 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 DLANST as described above.
NN is INTEGER The order of the matrix A. N >= 0. When N = 0, DLANST is set to zero.
DD is DOUBLE PRECISION array, dimension (N) The diagonal elements of A.
EE is DOUBLE PRECISION array, dimension (N1) The (n1) subdiagonal or superdiagonal elements of A.
Author:

Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
 September 2012
Definition at line 101 of file dlanst.f.
Author
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