Purpose
=======
DLANGE 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 matrix A.
Description
===========
DLANGE returns the value
DLANGE = ( 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.
Namespace: DotNumerics.LinearAlgebra.CSLapackAssembly: DWSIM.MathOps.DotNumerics (in DWSIM.MathOps.DotNumerics.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax public double Run(
string NORM,
int M,
int N,
double[] A,
int offset_a,
int LDA,
ref double[] WORK,
int offset_work
)
Public Function Run (
NORM As String,
M As Integer,
N As Integer,
A As Double(),
offset_a As Integer,
LDA As Integer,
ByRef WORK As Double(),
offset_work As Integer
) As Double
Request Example
View SourceParameters
- NORM String
-
(input) CHARACTER*1
Specifies the value to be returned in DLANGE as described
above.
- M Int32
-
(input) INTEGER
The number of rows of the matrix A. M .GE. 0. When M = 0,
DLANGE is set to zero.
- N Int32
-
(input) INTEGER
The number of columns of the matrix A. N .GE. 0. When N = 0,
DLANGE is set to zero.
- A Double
-
(input) DOUBLE PRECISION array, dimension (LDA,N)
The m by n matrix A.
- offset_a Int32
-
- LDA Int32
-
(input) INTEGER
The leading dimension of the array A. LDA .GE. max(M,1).
- WORK Double
-
(workspace) DOUBLE PRECISION array, dimension (MAX(1,LWORK)),
where LWORK .GE. M when NORM = 'I'; otherwise, WORK is not
referenced.
- offset_work Int32
-
Return Value
DoubleSee Also