On Sep 3, 10:52 am, Nicolas <nicolas.fresseng...@gmail.com> wrote:
> I am trying to do the following thing but I am not sure whether this
> is possible in sage (though I think it is in Mathematica)
>
> Let's say I define a symbolic function
>
> sage: f=function('f',x)
>
> I would like to issue some command to "tell" sage what the derivative
> of f is (for instance : g) so that the command
>
> sage: diff(f)
>
> would yield g
Yes, its possible also in Sage. I am giving you an example that you
can adapt for your need. (if you have have a function of multiple
arguments then you should read diff_param keywords. For example,
try heaviside?? in sage prompt to see how to read diff_param)
--------
sage: g = function('g')
sage: def f_deriv(*args, **kwds):
....: return g(*args)
....:
sage: f = function('f', derivative_func=f_deriv)
sage: f(x)
f(x)
sage: diff(f(x), x)
g(x)
------------
Best,
Golam
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