naginterfaces.library.blas.dnrm2w

naginterfaces.library.blas.dnrm2w(w, x)[source]

dnrm2w computes the weighted Euclidean norm of a real vector.

For full information please refer to the NAG Library document for f06fk

https://www.nag.com/numeric/nl/nagdoc_28.7/flhtml/f06/f06fkf.html

Parameters
wfloat, array-like, shape

, the vector of weights.

xfloat, array-like, shape

The -element vector .

Returns
nrmfloat

The weighted Euclidean norm of the real vector, .

Raises
NagValueError
(errno )

On entry, error in parameter .

Constraint: the elements of the array must not be negative.

Notes

No equivalent traditional C interface for this routine exists in the NAG Library.

dnrm2w returns the weighted Euclidean norm

of the -element real vector , where and is a vector of weights.