Element Stiffness MatrixΒΆ
The stiffness matrices are integrated numerically where the number of
integration points is fixed for each element type by the parameter npts.
The element has a number of dimensions defined by ndim. Suppose we have
nel 2-D elements (ndim=2) for which the stiffness matrix has to be
calculated, the following should be defined:
![j = [{j11}_1, {j12}_1, {j21}_1, {j22}_1, ...,
{j11}_{nel}, {j12}_{nel}, {j21}_{nel}, {j22}_{nel}]](../../_images/math/79b5896e7f58d4a58f7cfd95ff8fb9672bd7a65c.png)