- naginterfaces.library.blas.ddoti(x, indx, y)¶
ddoticomputes the scalar product of a sparse real vector, stored in compressed form, with a real vector.
For full information please refer to the NAG Library document for f06er
- xfloat, array-like, shape
The nonzero elements of the sparse vector .
- indxint, array-like, shape
must contain the index of in the sparse vector , for .
- yfloat, array-like, shape
The vector . Only elements corresponding to indices in are accessed.
The scalar product of the sparse real vector, , with the real vector .
No equivalent traditional C interface for this routine exists in the NAG Library.
ddotireturns the value of the scalar product
where is a sparse real vector, stored in compressed form and is a real vector in full storage format.
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