example_pseudornd2D 

Generates a 100x100 2-dimensional random perturbation 
the code for generating a 3D (x-y-z) or (x-y-t) random field is commented. 
A random seed is generated based on the machine clock to avoid generating 
the same field each time. 

Compiling:
Adapt the machine-specitic settings (compiler, etc.) in Makefile. The compilation
needs the library fftw. Paths to the library and the include file fftw.f have
to be specified.

Execution:
./pseudornd2D

then in gnuplot type 
splot 'PERT.txt' w l 
or 
plot 'PERT.txt' with image