
Hi, I'm a student studing for Math. & Infor. Ing. in Tirana,Albania and a have a final project in R to finish in a week, so I badly need your help...

The topic of the project is "Hermite Interpolation" and a I have allready done a script that finds the approximation in a certan point x, H(x) ~f(x) but i want to find the value of his derivative H'(x)~f'(x) as well and to do this I need the polynomial form of H(x)=a1*x^(2n+1) + a2*x^(2n) + ... + an but R requires x to be a value not a declared variable. Then I want to find the derivative of this polynomial and evaluate it.

So my point is how can I built a function f(x)=x^+x+1 and do its derivate dipending on x.

I also tryed:

>library(Ryacas)
>x <- Sym("x")
>Simplify(deriv(sqrt(1 - x^2),x,2)) but It didn't work

please help me or I'll have to repeat the year and it's my last year.

Thank you
 		 	   		  
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