Simulates a surface of water using the Finite Element Method. xray.jit.water implements a finite element simulation of a water surface. The algorithm used was modified from: http://www.u-aizu.ac.jp/~niki/papers/2005\%20Fast\%20water\%20animation.pdf . Since this is a FEM simulation, the more elements (i.e. cells), the more stable the simulation will be. Almost anything below a grid size of 100x100 is very unstable. The second inlet is similar to the second inlet of jit.op in that it can take both floats and matrices. Since the second inlet sets wavespeed, it can be used to simulate water of different depths. For instance, shallow water has a higher wavespeed than deep water. This object relies on feedback to run the simulation, sohaving a the same named matrix at both input and output as demonstrated here is required for proper use.