colour.utilities.dot_vector¶
-
colour.utilities.
dot_vector
(m, v)[source]¶ Convenient wrapper around
np.einsum()
with the following subscripts: ‘…ij,…j->…i’.It performs the dot product of two arrays where m parameter is expected to be an array of 3x3 matrices and parameter v an array of vectors.
Parameters: - m (array_like) – Array of 3x3 matrices.
- v (array_like) – Array of vectors.
Returns: Return type: ndarray
Examples
>>> m = np.array( ... [[0.7328, 0.4296, -0.1624], ... [-0.7036, 1.6975, 0.0061], ... [0.0030, 0.0136, 0.9834]] ... ) >>> m = np.reshape(np.tile(m, (6, 1)), (6, 3, 3)) >>> v = np.array([0.07049534, 0.10080000, 0.09558313]) >>> v = np.tile(v, (6, 1)) >>> dot_vector(m, v) array([[ 0.0794399..., 0.1220905..., 0.0955788...], [ 0.0794399..., 0.1220905..., 0.0955788...], [ 0.0794399..., 0.1220905..., 0.0955788...], [ 0.0794399..., 0.1220905..., 0.0955788...], [ 0.0794399..., 0.1220905..., 0.0955788...], [ 0.0794399..., 0.1220905..., 0.0955788...]])