scipy.linalg.

coshm#

scipy.linalg.coshm(A)[source]#

計算雙曲矩陣餘弦。

此常式使用 expm 來計算矩陣指數。

參數:

A(N, N) 類陣列: 輸入陣列。

回傳值:

coshm(N, N) ndarray: A 的雙曲矩陣餘弦

範例

>>> import numpy as np
>>> from scipy.linalg import tanhm, sinhm, coshm
>>> a = np.array([[1.0, 3.0], [1.0, 4.0]])
>>> c = coshm(a)
>>> c
array([[ 11.24592233,  38.76236492],
       [ 12.92078831,  50.00828725]])

驗證 tanhm(a) = sinhm(a).dot(inv(coshm(a)))

>>> t = tanhm(a)
>>> s = sinhm(a)
>>> t - s.dot(np.linalg.inv(c))
array([[  2.72004641e-15,   4.55191440e-15],
       [  0.00000000e+00,  -5.55111512e-16]])