On Wed, Oct 31, 2018 at 9:11 AM Francesco <francesco.manzin...@gmail.com> wrote:
>
> Hello; I have installed sage 8.4 and I have problem with the derivatives ...
> I have defined a function in sage of this type:
>
> x=var('x')
> def funz(x):
> if x >= 0:
> return x^2
> else:
> return x^3
>
> but, when I try to calculate
>
> diff(funz(x),x)
>
> I obtain only
>
> 3x^2
>
> and this is wrong !! Can you help me ?
Python functions are not mathematical functions, you cannot do
calculus on them---as opposed to f as below:
sage: f(x)=x^2
sage: f
x |--> x^2
sage: diff(f,x)
x |--> 2*x
I am not sure how to deal with piecewise-defined functions as yours,
in Sage, but I might be missing something.
>
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