naginterfaces.library.blas.dasum

naginterfaces.library.blas.dasum(x)

dasum returns the $1$-norm of the $n$-element real vector $x$.

For full information please refer to the NAG Library document for f06ek

https://support.nag.com/numeric/nl/nagdoc_30.2/flhtml/f06/f06ekf.html

Parameters

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

The $n$-element vector $x$.

Returns

sumxfloat

The $1$-norm of the $n$-element real 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.

dasum, returns the $1$-norm

$$\left|x_1\right|+\left|x_2\right|+\cdots +\left|x_n\right|$$

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