naginterfaces.library.blas.dnrm2

naginterfaces.library.blas.dnrm2(x)

dnrm2 returns the Euclidean norm of the $n$-element real vector $x$.

For full information please refer to the NAG Library document for f06ej

https://support.nag.com/numeric/nl/nagdoc_30.3/flhtml/f06/f06ejf.html

Parameters

xfloat, array-like, shape $\left(n\right)$

The $n$-element vector $x$.

Returns

nrmfloat

The Euclidean norm.

Raises

NagValueError

(errno $3$)

On entry, error in parameter $\text{incx}$.

Constraint: $\text{incx}>0$.

Notes

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

dnrm2 returns the Euclidean norm

$${\parallel x\parallel }_2=\sqrt{x^{T}x}$$

of the $n$-element real vector $x$.

References

Lawson, C L, Hanson, R J, Kincaid, D R and Krogh, F T, 1979, Basic linear algebra supbrograms for Fortran usage, ACM Trans. Math. Software (5), 308–325