On Fri, Nov 05, 2004 at 02:53:01PM +, MR K P SCHUPKE wrote:
> >My guess is because irrationals can't be represented on a discrete computer
>
> Well, call it arbitrary precision floating point then. Having built in
> Integer support, it does seem odd only having Float/Double/Rational...
There
Hi,
It has been common in recent years since the widespread use of package
management systems to break up configuration / settings files that are
used by several packages into a directory of individual files rather
than modifying a global file.
The advantage of doing this is that it makes things
The problem turned out to a Gentoo bug. :-(
It can be fixed by executing
ACCEPT_KEYWORDS=~x86 emerge libxslt
which upgrades to version 1.1.9-r1. With that, I can build
GHC again.
Sorry about the "misreport".
Peter
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Peter Simons wrote:
And some more information on the issue. When I run the
configure script, I see this error message on the screen
(which probably won't make it into the config.log output):
| checking for xmllint... /usr/bin/xmllint
| checking for DocBook DTD... ok
| checking for xsltproc... /u
And some more information on the issue. When I run the
configure script, I see this error message on the screen
(which probably won't make it into the config.log output):
| checking for xmllint... /usr/bin/xmllint
| checking for DocBook DTD... ok
| checking for xsltproc... /usr/bin/xsltproc
|
>[...] Thus (a-b) is not the same as -(b-a) for IEEE floats!
Nor is x*0 equal to 0 for every x; nor does x == y imply f(x) == f(y)
for every x, y, f; nor is addition or multiplication associative. There
aren't many identities that do hold of floating point numbers.
Yes, but they DO hold for Rat
Sven Panne writes:
>> /html/chunk.xsl happy.xml
>> warning: failed to load external entity "/html/chunk.xsl"
> It looks like configure hasn't found a DocBook XSL
> directory on your machine. Could you provide us with a
> little bit more information, please (log of the configure
> run, confi
On Fri, 2004-11-05 at 13:57, Henning Thielemann wrote:
> On Fri, 5 Nov 2004, Robert Dockins wrote:
>
> > What IEEE has done is shoehorned in some values that aren't really
> > numbers into their representation (NaN certainly; one could make a
> > convincing argument that +Inf and -Inf aren't num
In gmane.comp.lang.haskell.glasgow.user, you wrote:
> Is anyone else seeing this on his system?
> getUserEntryForName [] >>= print . userName
> "wasabi"
Fixed in CVS -- I was only able to test this on SunOS where your
example would segfault.
--
http://www-i2.informatik.rwth-aachen.de/stolz/ *
>My guess is because irrationals can't be represented on a discrete computer
Well, call it arbitrary precision floating point then. Having built in
Integer support, it does seem odd only having Float/Double/Rational...
Keean.
..
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Glasgow-has
On Fri, 5 Nov 2004, Robert Dockins wrote:
> What IEEE has done is shoehorned in some values that aren't really
> numbers into their representation (NaN certainly; one could make a
> convincing argument that +Inf and -Inf aren't numbers).
I wonder why Infinity has a sign in IEEE floating proces
My guess is because irrationals can't be represented on a discrete
computer (unless you consider a computaion, the limit of which is the
irrational number in question). A single irrational might not just be
arbitrarily long, but it may have an _infinite_ length representation!
What you have de
With GHCi, I get:
Prelude Ratio> toRational (1.0/0) :: Ratio Integer
179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150
>I would be very careful of adding non-rationals to the Rational type.
Why is there no Irrational class. This would make more sense for
Floats and Doubles than the fraction based Rational class. We could
also add an implementation of infinite precision irrationals using
a
pair of Integers for expo
On Thu, Nov 04, 2004 at 08:32:52PM +0100, Sven Panne wrote:
> It's an old thread, but nothing has really happened yet, so I'd like to
> restate and expand the question: What should the behaviour of toRational,
> fromRational, and decodeFloat for NaN and +/-Infinity be? Even if the report
> is uncle
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