Calculation of Partial Derivatives

see the code PD.cc

Visualize the result in MATLAB by (AWFD/Sources/Examples/pd.m)

`Ax =ReadUDF('../../Data/Test/Ax') ;
A1x=ReadUDF('../../Data/Test/A1x') ;
figure(1); surf(Ax.a ); shading flat;title 'dx evaluated on uniform grid'
figure(2); surf(A1x.a); shading flat;title 'dx evaluated on adaptive grid'
figure(3); surf(Ax.a-A1x.a); shading flat;title 'difference'
`

You should get the following three figures. Figures 1 and 2 show the nodal values of the derivative. Figure 3 shows the differences. They are very small.

koster 2003-07-29