numpy.tanh¶
-
numpy.
tanh
(x[, out]) = <ufunc 'tanh'>¶ 逐元素计算双曲正切。
等效于
np.sinh(x)/np.cosh(x)
或-1j * np.tan 1j * x)
。参数: x:array_like
输入数组。
out:ndarray,可选
与x形状相同的输出数组。
返回: y:ndarray
相应的双曲正切值。
上升: ValueError:invalid return数组shape
如果提供out并且out.shape!= x.shape
笔记
如果提供out,则函数将结果写入其中,并返回对out的引用。(参见实施例)
参考文献
[R284] Abramowitz和I.A. Stegun,Handbook of Mathematical Functions。New York,NY:Dover,1972,pg。83. http://www.math.sfu.ca/~cbm/aands/ [R285] 维基百科,“双曲函数”,http://en.wikipedia.org/wiki/Hyperbolic_function 例子
>>> np.tanh((0, np.pi*1j, np.pi*1j/2)) array([ 0. +0.00000000e+00j, 0. -1.22460635e-16j, 0. +1.63317787e+16j])
>>> # Example of providing the optional output parameter illustrating >>> # that what is returned is a reference to said parameter >>> out2 = np.tanh([0.1], out1) >>> out2 is out1 True
>>> # Example of ValueError due to provision of shape mis-matched `out` >>> np.tanh(np.zeros((3,3)),np.zeros((2,2))) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: invalid return array shape