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([0.20654008, 0.12197225, 0.05136952]) >>> v = np.tile(v, (6, 1)) >>> dot_vector(m, v) array([[ 0.1954094..., 0.0620396..., 0.0527952...], [ 0.1954094..., 0.0620396..., 0.0527952...], [ 0.1954094..., 0.0620396..., 0.0527952...], [ 0.1954094..., 0.0620396..., 0.0527952...], [ 0.1954094..., 0.0620396..., 0.0527952...], [ 0.1954094..., 0.0620396..., 0.0527952...]])