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11. By Miro on 2012-02-14

I added function space for scalar functions and also saving routine -
this needs further optimazation; I will try design these things later
with inheritance in mind. Later means when I see a correct solution to
laplace u = f with DirichletBC.

10. By Miro on 2012-02-13

in derivatives i started using thisArea criterion again, it works nicely
on hexagon, I have to test square with 'center' node sitting on the edge

9. By Miro on 2012-02-10

in one_sided_derivative I fixed problem of derivative in "impossible"
directions. Still plenty of work on central derivatives and also
different versions for these functions based on the input data. I am
going to take a brake from this problem and focus on saving data or
marking the nodes as boundaries for BC.

8. By Miro on 2012-02-09

central diff now working (so so). There is one interesting issue; when I
make radius smaller in main, function in main gets the y-derivative of
(x-1)**2 @ [0,0] correct no matter how small the radius is, whereas the
templated one_sided_derivative functions starts to diverge at
radius=1E-12. All I was able to figure out is that values
function<double>() and what() differ; 0 vs. 1E-17. But I can't figure
why that is. So for now, element size smaller than 1e-11 is at your own
risk.

7. By Miro on 2012-02-09

early stages of what seem to be functioning derivatives

6. By Miro on 2012-02-06

I added Evaluate and Grid class, but there's still no progress with
derivatives

5. By Miro on 2012-02-05

I started to play with derivatives (far from done), also I added Vector
class just for fun.

4. By Miro on 2012-02-03

improved performance of adding neighbors( I can get through 1e6
triangles in less than 10s). next up are the classes for evaluation of
functions and fields on nodes, and derivatives

3. By Miro on 2012-02-03

triangle class with vertices as Nodes (not * Nodes), functions
make_nodes and make_vertices perform well even with 262144 triangles,
building the neighbors of nodes however is very slow

2. By Miro on 2012-02-01

started with Triangle class