naginterfaces.library.blas.daxpy

naginterfaces.library.blas.daxpy(alpha, x, y)[source]

daxpy adds a scaled real vector to an unscaled real vector.

For full information please refer to the NAG Library document for f06ec

https://www.nag.com/numeric/nl/nagdoc_28.7/flhtml/f06/f06ecf.html

Parameters
alphafloat

The scalar .

xfloat, array-like, shape

The -element vector .

yfloat, array-like, shape

The -element vector .

Returns
yfloat, ndarray, shape

The updated vector .

Notes

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

daxpy performs the operation

where and are -element real vectors, and is a real scalar.

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