Module « scipy.linalg »

Fonction cosm - module scipy.linalg

Signature de la fonction cosm

def cosm(A) 

Description

cosm.__doc__

    Compute the matrix cosine.

    This routine uses expm to compute the matrix exponentials.

    Parameters
    ----------
    A : (N, N) array_like
        Input array

    Returns
    -------
    cosm : (N, N) ndarray
        Matrix cosine of A

    Examples
    --------
    >>> from scipy.linalg import expm, sinm, cosm

    Euler's identity (exp(i*theta) = cos(theta) + i*sin(theta))
    applied to a matrix:

    >>> a = np.array([[1.0, 2.0], [-1.0, 3.0]])
    >>> expm(1j*a)
    array([[ 0.42645930+1.89217551j, -2.13721484-0.97811252j],
           [ 1.06860742+0.48905626j, -1.71075555+0.91406299j]])
    >>> cosm(a) + 1j*sinm(a)
    array([[ 0.42645930+1.89217551j, -2.13721484-0.97811252j],
           [ 1.06860742+0.48905626j, -1.71075555+0.91406299j]])