man slanst (Fonctions bibliothèques) - return 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
NAME
SLANST - return 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
SYNOPSIS
- REAL FUNCTION
- SLANST( NORM, N, D, E )
- CHARACTER NORM
- INTEGER N
- REAL D( * ), E( * )
PURPOSE
SLANST 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.
DESCRIPTION
SLANST returns the value
SLANST = ( 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 SLANST as described above.
- N (input) INTEGER
- The order of the matrix A. N >= 0. When N = 0, SLANST is set to zero.
- D (input) REAL array, dimension (N)
- The diagonal elements of A.
- E (input) REAL array, dimension (N-1)
- The (n-1) sub-diagonal or super-diagonal elements of A.