Visible to Intel only — GUID: GUID-F455CA43-5B42-4E89-9768-F168A3702129
Visible to Intel only — GUID: GUID-F455CA43-5B42-4E89-9768-F168A3702129
?lanst/?lanht
Returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real symmetric or complex Hermitian tridiagonal matrix.
Syntax
val = slanst( norm, n, d, e )
val = dlanst( norm, n, d, e )
val = clanht( norm, n, d, e )
val = zlanht( norm, n, d, e )
Include Files
- mkl.fi
Description
The functions ?lanst/?lanht return the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real symmetric or a complex Hermitian tridiagonal matrix A.
Input Parameters
- norm
-
CHARACTER*1. Specifies the value to be returned by the routine:
= 'M' or 'm': val = max(abs(Aij)), largest absolute value of the matrix A.
= '1' or 'O' or 'o': val = norm1(A), 1-norm of the matrix A (maximum column sum),
= 'I' or 'i': val = normI(A), infinity norm of the matrix A (maximum row sum),
= 'F', 'f', 'E' or 'e': val = normF(A), Frobenius norm of the matrix A (square root of sum of squares).
- n
-
INTEGER. The order of the matrix A.
n≥ 0. When n = 0, ?lanst/?lanht is set to zero.
- d
-
REAL for slanst/clanht
DOUBLE PRECISION for dlanst/zlanht
Array, DIMENSION (n). The diagonal elements of A.
- e
-
REAL for slanst
DOUBLE PRECISION for dlanst
COMPLEX for clanht
DOUBLE COMPLEX for zlanht
Array, DIMENSION (n-1).
The (n-1) sub-diagonal or super-diagonal elements of A.
Output Parameters
- val
-
REAL for slanst/clanht
DOUBLE PRECISION for dlanst/zlanht
Value returned by the function.