  The solution of a nonlinear diffusion equation is numerically investigated
using the generalized Fourier transform method. This equation includes fractal
dimensions and power-law dependence on the radial variable and on the diffusion
function. The generalized Fourier transform approach is the extension of the
Fourier transform method used for normal diffusion equation. The feasibility of
the approach is validated by comparing the numerical result with the exact
solution for point-source. The merit of numerical method is that it provide a
way to calculate anomalous diffusion with an arbitrary initial condition.
