These are the features that I would like to see implemented:

1) Visualization of evolving curves and surfaces, i.e. plotting curves and
   surfaces whose shape changes with the time ( in the parametric equations
   of a such curve or surface appears the time variable ).

2) Expansion and shrinkage of the x-, y- and z-direction into the 3D-plots
   (Now a similar effect can be obtained only for the bidimensional graphics,
    because the user can set a rectangular display area).

3) Exporting data files in a format understandable by GNUplot.

4) Performing the procedures for the computation of the derivative, of the
   integrals and of the zeros of real functions of one variable.

5) Labelling of X and Y axes.

6) Autoranging of the plots (besides the user-defined ranging) (but this
   is the last thing should be done).

7) Now, even if the user can visualize up to 10 curve at the same time
   in bidimensional graphic, he cannot specify different values for
   the lower and upper limit of the interval of variation of the parameter
   (see introduction.txt).
   Moreover, he cannot specify different values for the number of the
   nodes of interpolation. I think that it is a good idea to let the user
   specify different values for each curve to be drawn.
   
8) (For the version 2.0) Visualization of curves in the complex plane
   (The parser will be strongly modified).
