naginterfaces.library.blas.dnegv

naginterfaces.library.blas.dnegv(x)

dnegv negates a real vector.

For full information please refer to the NAG Library document for f06fg

https://support.nag.com/numeric/nl/nagdoc_30.1/flhtml/f06/f06fgf.html

Parameters

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

The $n$-element vector $x$.

Returns

xfloat, ndarray, shape $\left(n\right)$

The vector $-x$.

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.

dnegv performs the operation

$$x\leftarrow -x$$

where $x$ is an $n$-element real vector.