naginterfaces.library.blas.zsctr

naginterfaces.library.blas.zsctr(x, indx, y)

zsctr scatters the elements of a sparse complex vector $x$ stored in compressed form, into a complex vector $y$ in full storage form.

For full information please refer to the NAG Library document for f06gw

https://support.nag.com/numeric/nl/nagdoc_30.1/flhtml/f06/f06gwf.html

Parameters

xcomplex, array-like, shape $\left(\text{nz}\right)$

The compressed vector $x$. $x$ contains $x_i$ for $i\in J$.

indxint, array-like, shape $\left(\text{nz}\right)$

The indices of the elements in the compressed vector $x$.

ycomplex, array-like, shape $(max\left(indx\right))$

The vector $y$.

Returns

ycomplex, ndarray, shape $(max\left(indx\right))$

The vector $y$, with the elements corresponding to indices in $indx$ altered.

Raises

NagValueError

(errno $3$)

On entry, error in parameter $indx$.

Constraint: the indices must be distinct.

Notes

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

References

Dodson, D S, Grimes, R G and Lewis, J G, 1991, Sparse extensions to the Fortran basic linear algebra subprograms, ACM Trans. Math. Software (17), 253–263