[R] (no subject)

[Richard.Cotton at hsl.gov.uk]

> if i have the following function,
> 
> f <- function(x) x^3-2*x^2+3*x-5
> 
> i need a simple function for the derivative of this with respect to 
> 'x', so that i can then sub in values to the the derivative 
> function, and use Newtons method of finding a root for this.

You could take a look at ?deriv, but since the example you presented is 
just a polymonial, you can probably learn about calculus (
http://en.wikipedia.org/wiki/Derivative#Derivatives_of_elementary_functions
) and differentiate it in your head in less time than it took you to write 
this help question.

Regards,
Richie.

Mathematical Sciences Unit
HSL



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