`scipy.linalg._fblas:zspr`

Signature

def zspr(n, alpha, x, ap, incx = 1, offx = 0, lower = 0, overwrite_ap = 0)

Packed symmetric rank-1 update ap = alpha*outer(x, x) + ap (BLAS zspr).

n : int: Order of the matrix.
alpha : complex: Scalar multiplier.
x : ndarray: Input vector.
ap : ndarray: Symmetric matrix in packed storage, updated in place.
incx : int, optional: Stride between successive elements of x. Default is 1.
offx : int, optional: Index of the first element of x to use. Default is 0.
lower : int, optional: If 0, the upper triangle is used; if 1, the lower. Default is 0.
overwrite_ap : int, optional: If nonzero, ap may be overwritten in place. Default is 0.