Hello,
On Wed, Oct 28, 2009 at 9:55 PM, Erik <[email protected]> wrote:
>
> I would like to iterate a function:
>
> def f(x):
> return( (1/5)*(x**3+x**2-3) )
> f(0)
>
> Running evaluate on the above yields the quantity -3/5. Rather than
> evaluating f(-3/5), is there a way to reference the previous output
> from evaluate, i.e. to evaluate f(previous) or some similar syntax?
On the Sage command line, the previous result is stored in _. So, you
can do f(_).
> Similarly, is there a way to use the syntax "for i in range()" to
> define the next i as f(i)? I know that "for i in range(-2,2,i=f(i))"
I'm not exactly sure what you want, but here's my best guess. You
could use a while loop.
i = -2
while i < 2:
do_something()
i = f(i)
--Mike
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