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scipy.linalg.

# tanhm

scipy.linalg.tanhm(A)

  Compute the hyperbolic matrix tangent.

  This routine uses expm to compute the matrix exponentials.

  The documentation is written assuming array arguments are of specified “core” shapes. However, array argument(s) of this function may have additional “batch” dimensions prepended to the core shape. In this case, the array is treated as a batch of lower-dimensional slices; see Batched Linear Operations for details. Note that calls with zero-size batches are unsupported and will raise a `ValueError`.

  Parameters:
    A(N, N) array_like

      Input array

  Returns:
    tanhm(N, N) ndarray

      Hyperbolic matrix tangent of A

  Examples

      >>> import numpy as np
      >>> from scipy.linalg import tanhm, sinhm, coshm
      >>> a = np.array([[1.0, 3.0], [1.0, 4.0]])
      >>> t = tanhm(a)
      >>> t
      array([[ 0.3428582 ,  0.51987926],
             [ 0.17329309,  0.86273746]])

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

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