scipy.linalg.blas.zspmv#
- scipy.linalg.blas.zspmv(n, alpha, ap, x, incx=1, offx=0, beta=0.0, y=None, incy=1, offy=0, lower=0, overwrite_y=0) = <fblas function zspmv>#
Compute
y = alpha*a@x + beta*yfor a packed symmetric matrix (BLASzspmv).- Parameters:
- nint
Order of the matrix.
- alphacomplex
Scalar multiplier for the product.
- apndarray
The symmetric matrix in packed storage.
- xndarray
Input vector.
- incxint, optional
Stride between successive elements of x. Default is 1.
- offxint, optional
Index of the first element of x to use. Default is 0.
- betacomplex, optional
Scalar multiplier for y. Default is 0.
- yndarray, optional
Input/output vector; if omitted a new zero vector is allocated. Default is None.
- incyint, optional
Stride between successive elements of y. Default is 1.
- offyint, optional
Index of the first element of y to use. Default is 0.
- lowerint, optional
If 0, the upper triangle is used; if 1, the lower. Default is 0.
- overwrite_yint, optional
If nonzero, y may be overwritten in place. Default is 0.
- Returns:
- yndarray
The vector
alpha*a@x + beta*y.