On Jul 18, 2008, at 12:04 PM, aniura wrote:
> Hi,
>
> I have no experience in sage, I began to use it two days ago because I
> need arbitrary precision arithmetic and Octave is not so god for
> that.
>
> I wanted to write a script where I evaluate a function which is also
> written in a script. this can be done in Octave , f. ex. by using
> "feval", but I have not found anything similar in sage. could anybody
> give some suggestion?
>
> thanks in advance,
In Python (and hence Sage) functions are first-level objects, so one
can pass them around like anything else, so there's no need for
feval. For example, I can write
def foo(f, x):
return f(x) + f(f(x))
sage: foo(sin, 3)
sin(sin(3)) + sin(3)
sage: foo(sqrt, 20)
2*sqrt(5) + sqrt(2)*5^(1/4)
- Robert
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