naginterfaces.library.blas.dsctr

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

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

For full information please refer to the NAG Library document for f06ew

https://support.nag.com/numeric/nl/nagdoc_30.1/flhtml/f06/f06ewf.html

Parameters

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

The nonzero elements of the sparse vector $x$.

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

$indx[\text{i}-1]$ must contain the index of $x[\text{i}-1]$ in the sparse vector $x$, for $\text{i}=1,2,\dots ,\text{nz}$.

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

The vector $y$.

Returns

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

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

Notes

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

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

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