Non-linear elasticity Example

Hi FreeFEM team,

In the line 124 of the code for the Non-linear elasticity Example (https://doc.freefem.org/models/non-linear-elasticity.html), why only “un” is updated? Why we don’t need to update “vn” (e.g., vn[] -= vv[]:wink:

Thank you very much,
Yan

Please read the documentation, especially the “Warning” paragraph of the linked section.

Oh, I see. Thank you!