Re: differential and integral calculus

[Michael Creel]

On Friday 04 February 2005 15:15, address@hidden wrote:

> > f(x)=(x^2-3x)*sin x
> > f'(x)=?
>
> Athough Octave will not provide a symbolic answer for the above example,
> you can use the formula below to provide approximations for plotting the
> derivative:
>
> f'(x) = limit[as dx approaches zero]((f(x + dx) - f(x))/dx)
>
> Choose dx to whatever accuracy you desire.

You might also try numgradient, in octave-forge. In that function, dx is 
chosen automatically, with the aim of improving accuracy.
M.



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