Rational numbers

[aleaxit]

I'm writing this message on a MacOS 10.3.9 box with Xcode 1.5 (gcc 3.3)
installed. If you tell me how, I'd be happy to compile it for you.

Contact me through the feedback form on the site below.

Thanks, but unfortunately getting GMP 4.2 built right on any platform
is never a trivial task -- GMP's maintainer is apparently actively
hostile to any attempts of making fixes to GMP to make it build
correctly on MAC OS X, in particular. I have a correspondent who
thinks he's got a working patch (for PPC on MacOSX 10.4, at least);
he's very busy but I hope he'll send it to me eventually.

gmpy itself is or should be pretty trivial to build on any platform
(and I'll always happily accept any fixes that make it better on any
specific platform, since it's easy to make them conditional so they'll
apply to that platform only), but the underlying GMP is anything but:-
(.


Alex

 

[Fernando Perez]

gmpy itself is or should be pretty trivial to build on any platform
(and I'll always happily accept any fixes that make it better on any
specific platform, since it's easy to make them conditional so they'll
apply to that platform only), but the underlying GMP is anything but:-
(.

Alex, have you had a look at SAGE?

http://modular.math.washington.edu/sage/

it uses GMP extensively, so they've had to patch it to work around these
issues. You can look at the SAGE release (they package everything as the
original tarball + patches) for the GMP-specific stuff you need, though I
suspect you'll still want to play with SAGE a little bit . It's a mighty
impressive system.

Cheers,


f

 

[Gabriel Genellina]

I would be interested, under which circumstances the rule is broken.
In my (few) tests, hash(a)==hash(b) worked.

I can't reproduce this issue with the latest mx experimental package, it
appears to be fixed now. Also, I'm currently using Python 2.5 and it was
2.3 by that time.

 

[aleaxit]

Alex, have you had a look at SAGE?

http://modular.math.washington.edu/sage/

it uses GMP extensively, so they've had to patch it to work around these
issues. You can look at the SAGE release (they package everything as the
original tarball + patches) for the GMP-specific stuff you need, though I
suspect you'll still want to play with SAGE a little bit . It's a mighty
impressive system.

Thanks Fernando, I will take a look at that.


Alex

 

[Fernando Perez]

Thanks Fernando, I will take a look at that.

Just to save you a bit of time, if you unpack the source tarball, inside the
distro you'll find a bunch of .spkg files. Those are really .tar.bz2 files
for each included package, containing the original plus any SAGE patches
and some install-related scripts.

The GMP .spkg has all the OSX patches, plus a few more.

Cheers,


f

 

[M.-A. Lemburg]

Hi,

I am starting to use rationals and since I found no batteries included,
I tried out the mxNumber package.

However, I get strange warnings on comparison operations
(which however seem to yield correct results):

---
$ python
Python 2.4.3 (#1, Jan 15 2007, 15:46:19)
[GCC 4.1.1 (Gentoo 4.1.1-r3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.__main__:1: RuntimeWarning: tp_compare didn't return -1, 0 or 1
False

FYI: The next version of mxNumber will have this warning removed.

Is there any rational number library around that
1) is comparably fast for large denominators
2) allows deriving types from Rationals without wrapping?

Regards

Martin

P.S. The respective mailing list does not like me, so that I try my
luck here.

Why is that ? The egenix-user mailing is open for all our users.
We do require registration to stop spam from reaching the list.

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eGenix.com

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