sparse_vector_class.py 文件源码

def cosh(a):
    """Elementwise hyperbolic cosine."""
    if not isSparseVector(a):
        raise TypeError("Argument must be a SparseVector")
    rv = SparseVector(a.n, {})
    for k in a.values.keys():
        rv.values[k] = math.cosh(a.values[k])
    return rv