coords.Coords.inertia

Coords.inertia(mass=None)

Return inertia related quantities of the Coords.

Parameters

mass: float array, optional

If provided, it is a 1-dim array with n_points() weight values for the points, in the order of the points(). The default is to attribute a weight 1.0 to each point.

Returns

Inertia

The Inertia object has the following attributes:

• mass: the total mass (float)

• ctr: the center of mass: float (3,)

• tensor: the inertia tensor in the central axes: shape (3,3)

See Also

• principal_coordsys(): Return the principal axes of the inertia tensor

Examples

>>> from hellotriangle.elements import Tet4
>>> I = Tet4.vertices.inertia()
>>> print(I.tensor)
[[1.5  0.25 0.25]
 [0.25 1.5  0.25]
 [0.25 0.25 1.5 ]]
>>> print(I.ctr)
[0.25 0.25 0.25]
>>> print(I.mass)
4.0