Re: Float comparison

In article <49f8747d.779348390@xxxxxxxxxxxxxxxxx> cri@xxxxxxxx (Richard Harter) writes:
On Wed, 29 Apr 2009 10:21:36 GMT, "*** T. Winter"
<***.Winter@xxxxxx> wrote:
....
Did you deliberately ignore what I wrote? I wrote: "the bounds of the
range are *not* eps(x * y), but eps(x + y)". Sheesh.

I'm sorry, but it seems to me that you are castigating cbf (in
itself quite the rage these days) quite unfairly. I know what he
is doing; he is deriving the extent of the bounds of the range of
x*y and showing that it is the same as the extent of the bounds
of x+y.

No, you misunderstand. Cbf is stating that a value represents a range.
So when you calculate (in float) z = x * y, z represents a range, bounded
by eps(z). I asked him how it was possible that a possible value for the
ranges represented by x and y could not be in the range represented by z.
He still has not given an answer.
--
*** t. winter, cwi, science park 123, 1098 xg amsterdam, nederland, +31205924131
home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~***/
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