rotation_matrix

sknano.core.math.rotation_matrix(angle=None, axis=None, anchor_point=None, rot_point=None, from_vector=None, to_vector=None, degrees=False, verbose=False, **kwargs)

Generate an \(n\times n\) rotation matrix.

New in version 0.3.0.

Parameters:

• angle (float) – Rotation angle in radians. If degrees is True, angle will be converted to radians from degrees. The sense of the rotation is defined by the right hand rule: If your right-hand’s thumb points along the axis, then your fingers wrap around the axis in the positive sense of the rotation angle.
• axis ({None, array_like, str}, optional) – An \(n\)-element array_like sequence defining the \(n\) components of the rotation axis or the string x, y, or z representing the \(x, y, z\) axes of a Cartesian coordinate system in 3D with unit vectors \(\mathbf{v}_x=\mathbf{\hat{x}}\), \(\mathbf{v}_y=\mathbf{\hat{y}}\), and \(\mathbf{v}_z=\mathbf{\hat{z}}\), respectively.
• anchor_point (Point, optional) –
• rot_point (Point, optional) –
• to_vector (from_vector,) –
• degrees (bool, optional) – If True, convert angle from degrees to radians.

Returns:

Rmat – If axis is None then Rmat will be a \(2D\) rotation matrix \(R(\theta)\) that rotates \(2D\) vectors counterclockwise by angle \(\theta\).

If axis is not None then Rmat will be a rotation matrix that gives a rotation around the direction of the vector axis.

Return type:

ndarray