naginterfaces.library.blas.darang

naginterfaces.library.blas.darang(x)

darang returns the absolutely largest and absolutely smallest values from a real vector.

For full information please refer to the NAG Library document for f06fl

https://support.nag.com/numeric/nl/nagdoc_30.3/flhtml/f06/f06flf.html

Parameters

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

The $n$-element vector $x$.

Returns

xmaxfloat

The value $x_{max}={max}_i\left|x_i\right|$.

xminfloat

The value $x_{min}={min}_i\left|x_i\right|$.

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.

darang returns the values $x_{max}$ and $x_{min}$ given by

$$x_{max}={max}_i\left|x_i\right|\text{,}{x}_{min}={min}_i\left|x_i\right|\text{,}$$

where $x$ is an $n$-element real vector. If $n<1$, then $x_{max}$ and $x_{min}$ are returned as zero.