Significant digits in a float?
Steven D'Aprano
steve+comp.lang.python at pearwood.info
Tue Apr 29 22:50:58 EDT 2014
On Tue, 29 Apr 2014 09:38:33 -0400, Roy Smith wrote:
> > What reason do you have to think that something recorded to 14 decimal
> > places was only intended to have been recorded to 4?
>
> Because I understand the physical measurement these numbers represent.
> Sometimes, Steve, you have to assume that when somebody asks a question,
> they actually have asked the question then intended to ask.
Heh, having been in *exactly* your situation of having people questioning
my constraints, I can sympathise with your frustration. I was pretty
frustrated too.
But I've also been in situations where I've been so close to a question
that I couldn't see the big picture, and a few dumb questions made me
realise that in fact I was missing something obvious which changed the
situation completely. To paraphrase:
Me: How do I square the circle with only a compass and straightedge?
Them: You can't. It's impossible. Are you sure you need only use
compass and straightedge? Can you use a rolling circle and a
marked ruler?
Me: Come come, I've told you my requirements, compass and straightedge
only. Now solve my problem!
Them: Does it have to be in Euclidean space? Why don't you perform
the construction in Gauss-Bolyai-Lobachevsky space?
Me: Perhaps a rolling circle and ruler isn't such a bad idea...
http://www.cut-the-knot.org/impossible/sq_circle.shtml
http://mathworld.wolfram.com/CircleSquaring.html
:-)
--
Steven D'Aprano
http://import-that.dreamwidth.org/
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