`scipy.linalg._fblas:csyr2k`

Signature

def csyr2k(alpha, a, b, beta = 0.0, c = None, trans = 0, lower = 0, overwrite_c = 0)

Symmetric rank-2k update c = alpha*(op(a)@op(b).T + op(b)@op(a).T) + beta*c (BLAS csyr2k).

alpha : complex: Scalar multiplier for the product.
a : ndarray: First input matrix.
b : ndarray: Second input matrix.
beta : complex, optional: Scalar multiplier for c. Default is 0.
c : ndarray, optional: Symmetric matrix to update; if omitted a new zero matrix is allocated. Default is None.
trans : int, optional: Operation on the matrix: 0 none, 1 transpose, 2 conjugate transpose. Default is 0.
lower : int, optional: If 0, the upper triangle is used; if 1, the lower. Default is 0.
overwrite_c : int, optional: If nonzero, c may be overwritten in place. Default is 0.