def idz_snorm(m, n, matveca, matvec, its=20):
 (snorm, v) = _id.idz_snorm(m, n, matveca, matvec, its)
 return snorm

def idz_snorm ( m , n , matveca , matvec , its = 20 ) : ( snorm , v ) = _id . idz_snorm ( m , n , matveca , matvec , its ) return snorm
estimate spectral norm of a complex matrix by the randomized power method .