Le 04/02/2012 17:21, rjf a écrit :
On Feb 2, 1:29 pm, Julien Puydt<julien.pu...@laposte.net> wrote:
+1 A user asking for a floating-point computation means (s)he is ready
to accept the results are mathematically wrong, but computationally
within a reasonable error range.
There are lots of reasonable expectations. Like the answer will be
the same
if the computation is repeated [except for randomized algorithms,
perhaps].
I think that a good system will be a lot better than you specified.
For
example, if a well-known algorithm gets the answer correct exactly,
that
the routine in Sage should do as well. As I said previously, I think
you
would be unhappy if cos(0.0) came out as 1.000000000000000999
I would be happy if that question triggered that answer.
I would only be unhappy if asking "cos(0)" (ie: exact argument) yielded
anything short of "1" (ie: exact answer).
This is about *numerical* computations!
Snark on #sagemath
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