naginterfaces.library.blas.zgthrz(y, indx)[source]

zgthrz gathers specified (usually nonzero) elements of a complex vector in full storage form into a sparse complex vector in compressed form. The specified elements of are set to zero.

For full information please refer to the NAG Library document for f06gv

ycomplex, array-like, shape

The vector . Only elements corresponding to indices in are accessed.

indxint, array-like, shape

must contain the set of indices .

ycomplex, ndarray, shape

The elements of corresponding to indices in are set to zero.

xcomplex, ndarray, shape

The compressed vector .


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


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