fractional derivatives and integrals?



Hi,

is it possible to calculate fractional derivatives or integrals? And
do some fractional calculus in general?

For instance I did:

(%i1) x^2;
(%i2) diff(%,x,0.5);
(%i3) plot2d([%], [x,-5,5]);

and I got some errors instead of a plot.

When I explicitly define, a fractional derivative of x^n then it
"sort of" works, but then, how to push it forward with derivatives of
anything more complex than x^n ?

(%i1) fractional_derivative_of_x_n(x,n,k):=(gamma(k+1)/gamma(k-n+1))*x^(k-n);


-- 
Janek Kozicki                               http://janek.kozicki.pl/  |