On Thu, 5 Aug 2010, Ivan Lazar Miljenovic wrote:
On 5 August 2010 10:15, Lennart Augustsson lenn...@augustsson.net wrote:
You're right. It's bad to have toRational in Real. It's also bad to
have Show and Eq as superclasses to Num.
I understand why it's bad to have Show as a superclass,
On Wed, 4 Aug 2010, John Meacham wrote:
The numeric classes are sort of messed up when it comes to non integral
values. (not that they are perfect for other things) for instance,
realToFrac doesn't preserve NaN or Infinity,
Why should realToFrac do this? NaN, Infinity and +/-0 are IEEE
On Thu, Aug 5, 2010 at 11:35 AM, Henning Thielemann
lemm...@henning-thielemann.de wrote:
What else shall a rounding function return if not integers?
Getting from 29.84645 to 29.85 isn't rounding ?
David.
___
Haskell-Cafe mailing list
Henning Thielemann lemm...@henning-thielemann.de writes:
On Wed, 4 Aug 2010, John Meacham wrote:
and the rounding functions discard information too by trying to
convert a floating point value to an integral one...
What else shall a rounding function return if not integers?
Some people may
On 05.08.2010 13:35, Henning Thielemann wrote:
On Wed, 4 Aug 2010, John Meacham wrote:
The numeric classes are sort of messed up when it comes to non integral
values. (not that they are perfect for other things) for instance,
realToFrac doesn't preserve NaN or Infinity,
Why should
David Virebayre dav.vire+hask...@gmail.com writes:
On Thu, Aug 5, 2010 at 11:35 AM, Henning Thielemann
lemm...@henning-thielemann.de wrote:
What else shall a rounding function return if not integers?
Getting from 29.84645 to 29.85 isn't rounding ?
Yes it is:
Yes, for instance to be able to use functions as number.
Or to be able to use constructive real numbers as numbers, since
equality is not computable.
-- Lennart
On Thu, Aug 5, 2010 at 4:17 AM, Ivan Lazar Miljenovic
ivan.miljeno...@gmail.com wrote:
On 5 August 2010 10:15, Lennart Augustsson
On Thu, 5 Aug 2010, David Virebayre wrote:
On Thu, Aug 5, 2010 at 11:35 AM, Henning Thielemann
lemm...@henning-thielemann.de wrote:
What else shall a rounding function return if not integers?
Getting from 29.84645 to 29.85 isn't rounding ?
Sure, it is, I missed that. Maybe such rounding
On Thu, Aug 05, 2010 at 11:35:04AM +0200, Henning Thielemann wrote:
Why should realToFrac do this? NaN, Infinity and +/-0 are IEEE hacks for
the common numerical applications you do with floating point numbers.
These special values could be supported by floating point specific, or
even
On Thu, Aug 5, 2010 at 1:11 PM, John Meacham j...@repetae.net wrote:
use. This isn't to say ghc is doing the wrong thing, I don't think there
really is a right thing to do here given the broken class specifications
in the report.
I often read that the numerical classes are problematic.
At the
On Thu, 5 Aug 2010, David Virebayre wrote:
On Thu, Aug 5, 2010 at 1:11 PM, John Meacham j...@repetae.net wrote:
use. This isn't to say ghc is doing the wrong thing, I don't think there
really is a right thing to do here given the broken class specifications
in the report.
I often read that
On Thu, Aug 5, 2010 at 1:55 PM, Henning Thielemann
lemm...@henning-thielemann.de wrote:
It's even worse: The NumericPrelude is in progress, certainly currently
better than Haskell 98's type classes, but there are known problems.
Sometimes new numeric types are implemented and require to refine
On Thu, 5 Aug 2010, David Virebayre wrote:
It's sad because the class alias proposal was dropped from Haskell'
two years ago, isn't it ?
I don't know, but I think before an extension can go into Haskell' it
should be at least implemented somewhere. (Is it implemented in JHC at
all?)
It's sad because the class alias proposal was dropped from Haskell'
two years ago, isn't it ?Haskell' is an ongoing process of language revision. ClassAliases did not get into Haskell 2010, but it could certainly be adopted in 2011 or 2012, if there were consensus support for it. Usually,
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 8/5/10 05:47 , David Virebayre wrote:
On Thu, Aug 5, 2010 at 11:35 AM, Henning Thielemann
lemm...@henning-thielemann.de wrote:
What else shall a rounding function return if not integers?
Getting from 29.84645 to 29.85 isn't rounding ?
It is,
Henning Thielemann wrote:
On Wed, 4 Aug 2010, John Meacham wrote:
The numeric classes are sort of messed up when it comes to non integral
values. (not that they are perfect for other things) for instance,
realToFrac doesn't preserve NaN or Infinity,
Why should realToFrac do this? NaN,
On Aug 4, 2010, at 11:30 AM, Omari Norman wrote:
Why is toRational a method of Real? I thought that real numbers need
not
be rational, such as the square root of two. Wouldn't it make more
sense
to have some sort of Rational typeclass with this method? Thanks.
You can't build the real
You're right. It's bad to have toRational in Real. It's also bad to
have Show and Eq as superclasses to Num.
On Wed, Aug 4, 2010 at 8:30 PM, Omari Norman om...@smileystation.com wrote:
Why is toRational a method of Real? I thought that real numbers need not
be rational, such as the square
On Wed, Aug 04, 2010 at 02:30:10PM -0400, Omari Norman wrote:
Why is toRational a method of Real? I thought that real numbers need not
be rational, such as the square root of two. Wouldn't it make more sense
to have some sort of Rational typeclass with this method? Thanks.
The numeric classes
Why is toRational a method of Real? I thought that real numbers need not
be rational, such as the square root of two. Wouldn't it make more sense
to have some sort of Rational typeclass with this method?
I think everyone has problems with the Haskell numeric typeclasses.
The answer in this
On 5 August 2010 10:15, Lennart Augustsson lenn...@augustsson.net wrote:
You're right. It's bad to have toRational in Real. It's also bad to
have Show and Eq as superclasses to Num.
I understand why it's bad to have Show as a superclass, but why Eq?
Because it stops you from using functions
21 matches
Mail list logo
