[#10467] Module re-inclusion in 1.9 vs 1.8 — "Rick DeNatale" <rick.denatale@...>
Some months ago I noticed that the semantics of module inclusion had
[#10468] Floats that are NaN have strange behavior — Jonas Kongslund <jonas@...>
Hi
[#10478] Plan to add ext/digest/lib/digest/hmac.rb to 1.8.6 or 1.8.7? — "Zev Blut" <rubyzbibd@...>
Hello,
[#10480] Ruby 1.8.6 delayed for seven days — "Akinori MUSHA" <knu@...>
I am afraid I have to announce that Ruby 1.8.6 final release will be
[#10490] Join with block — "Farrel Lifson" <farrel.lifson@...>
This patch adds the ability to give the Array#join method a block like so
[#10492] Ruby 1.8.6 preview3 has been released — "Akinori MUSHA" <knu@...>
Hi,
Akinori MUSHA wrote:
On Mon, 5 Mar 2007, Akinori MUSHA wrote:
On Mar 5, 2007, at 04:16, Hugh Sasse wrote:
On Tue, 6 Mar 2007, Eric Hodel wrote:
On Mar 5, 2007, at 10:46, Hugh Sasse wrote:
On Tue, 6 Mar 2007, Eric Hodel wrote:
On Mar 5, 2007, at 12:07, Hugh Sasse wrote:
On Tue, 6 Mar 2007, Eric Hodel wrote:
Hi,
On Tue, 6 Mar 2007, Nobuyoshi Nakada wrote:
Hi,
[#10494] make check for 1.8.6-preview3: TestDBM: DBMError: dbm_store failed — <noreply@...>
Bugs item #9031, was opened at 2007-03-04 12:57
[#10507] Dynamic Array#join with block — <noreply@...>
Patches item #9055, was opened at 2007-03-05 19:57
Hi,
On 06/03/07, Nobuyoshi Nakada <nobu@ruby-lang.org> wrote:
On 06/03/07, Nobuyoshi Nakada <nobu@ruby-lang.org> wrote:
Hi,
On 09/03/07, Nobuyoshi Nakada <nobu@ruby-lang.org> wrote:
[#10536] DRb freezes YARV? — "Meinrad Recheis" <meinrad.recheis@...>
dear all,
[#10552] ruby 1.8.5p12: default IO object for gets() ? — Unknown <borg@...3.net>
Hello..
[#10563] Ruby 1.8.6 has been released — "Akinori MUSHA" <knu@...>
Hello,
[#10575] 'rescue' with non-exception class — Brian Candler <B.Candler@...>
I was just caught out by this odd behaviour: a 'rescue' clause doesn't
[#10580] Kernel#exec on OSX — "Kent Sibilev" <ksruby@...>
Does anyone know how to explain this:
[#10585] Bugfix: Extension Compile Error with 1.8.6 — Lothar Scholz <mailinglists@...>
Hello,
[#10594] grave bug in 1.8.6's thread implementation — Sylvain Joyeux <sylvain.joyeux@...4x.org>
In ext/thread/thread.c, remove_one leaves the list in an inconsistent state.
On Thu, 15 Mar 2007 00:15:57 +0900, Sylvain Joyeux <sylvain.joyeux@m4x.org> wrote:
> > The fix is in thread-mutex-remove_one.diff.
On Thu, 15 Mar 2007 01:19:04 +0900, Sylvain Joyeux <sylvain.joyeux@m4x.org> wrote:
On Wednesday 14 March 2007 17:29, MenTaLguY wrote:
On Thu, 15 Mar 2007 01:48:42 +0900, Sylvain Joyeux <sylvain.joyeux@m4x.org> wrote:
Here the next one (hopefully the last)
On Thu, 15 Mar 2007 03:11:41 +0900, Sylvain Joyeux <sylvain.joyeux@m4x.org> wrote:
On Wednesday 14 March 2007, MenTaLguY wrote:
On Thu, 15 Mar 2007 06:07:30 +0900, Sylvain Joyeux <sylvain.joyeux@m4x.org> wrote:
At Thu, 15 Mar 2007 10:18:19 +0900,
> Which set of patches do you think should be committed? The former to
[#10615] Multiton in standard library — TRANS <transfire@...>
Hi--
On 3/15/07, Tom Pollard <tomp@earthlink.net> wrote:
On Mar 15, 2007, at 11:46 PM, TRANS wrote:
On 3/16/07, James Edward Gray II <james@grayproductions.net> wrote:
[#10646] Marshal.dump shouldn't complain about singletons if the _dump method is defined — <noreply@...>
Bugs item #9376, was opened at 2007-03-19 15:58
noreply@rubyforge.org wrote:
On Monday 19 March 2007 18:01, Urabe Shyouhei wrote:
Hi,
On 3/19/07, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
Hi,
> |But what if that singleton class just contained a method that allowed
Hi,
[#10701] Discrepancy between GetoptLong.new and documentation — <noreply@...>
Bugs item #8384, was opened at 2007-02-02 10:06
> -----Original Message-----
[#10705] Google Summer of Code proposal. — "Pedro Del Gallego" <pedro.delgallego@...>
Hi,
On 3/21/07, Pedro Del Gallego <pedro.delgallego@gmail.com> wrote:
[#10711] Re: Extensions to ipaddr.rb — Brian Candler <B.Candler@...>
> Is this your intention?
[#10712] Ruby Method Signatures (was Re: Multiton in standard library) — "Rick DeNatale" <rick.denatale@...>
On 3/19/07, TRANS <transfire@gmail.com> wrote:
On 3/19/07, TRANS <transfire@gmail.com> wrote:
On 3/21/07, Jos Backus <jos@catnook.com> wrote:
On 3/21/07, TRANS <transfire@gmail.com> wrote:
On Thu, Mar 22, 2007 at 10:26:38PM +0900, Rick DeNatale wrote:
On 3/22/07, Paul Brannan <pbrannan@atdesk.com> wrote:
On 3/23/07, Rick DeNatale <rick.denatale@gmail.com> wrote:
[#10729] BUGS in metaclasses inheritance — <noreply@...>
Bugs item #9462, was opened at 22/03/2007 11:19
noreply@rubyforge.org wrote:
[#10746] sub-process with Test::Unit does not exit error code as expected — <noreply@...>
Bugs item #9300, was opened at 2007-03-15 03:35
Hi,
[#10749] class_extension — TRANS <transfire@...>
I'm just following up to find out the status of consideration for
[#10768] Lastest Version IRHG - Technical Review Requested — Charles Thornton <ceo@...>
TO: CORE
[#10798] Virtual classes and 'real' classes -- why? — "John Lam (CLR)" <jflam@...>
I was wondering if someone could help me understand why there's a parallel =
On Thu, 29 Mar 2007 04:44:16 +0900, "John Lam (CLR)" <jflam@microsoft.com> wrote:
Thanks for sharing the eigenclass hack.
John Lam (CLR) wrote:
[#10818] Bug in Net::HTTP#keep_alive? — Aaron Patterson <aaron@...>
Sometimes Apache will send a connection header like this:
Should I submit a bug for this? I guess I'm not sure what proper
[#10826] Comparable module and values of <=> operator — David Flanagan <david@...>
The rdoc for the Comparable module and its methods consistently indicate
Replying to my own post...
I think there's nothing wrong with the implementation and documentation.
[ ruby-Bugs-9360 ] Matrix inverse problem
Bugs item #9360, was opened at 2007-03-18 14:41
You can respond by visiting:
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=9360&group_id=426
Category: Standard Library
Group: 1.8.6
Status: Open
Resolution: None
Priority: 3
Submitted By: Stefan M端hlebach (muehlebach)
Assigned to: Nobody (None)
Summary: Matrix inverse problem
Initial Comment:
There is a problem with the Matrix.inverse method.
Given the following matrix
m = Matrix[[0.417787968829298, 0.542037605627772, 0.729142268138943],
[0.0, 6.12303176911189e-17, 1.0],
[-0.542037605627772, 0.417787968829298, -2.55812900589452e-17]]
the result of
m.inverse * m
is
[[1.0, 0.0, 0.650423523448542],
[5.55111512312578e-17, 1.0, 0.84385869292008],
[0.0, 9.24446373305873e-33, 1.0]]
but it should be
[[1.0, 0.0, 0.0],
[0.0, 1.0, 0.0],
[0.0, 0.0, 1.0]]
or close to this!
----------------------------------------------------------------------
Comment By: Ed Borasky (znmeb)
Date: 2007-03-18 15:27
Message:
Questions:
1. Have you loaded "mathn"? If not, load it and try again. The "Matrix" routines are more accurate with "mathn" loaded.
2. What is the problem you're actually trying to solve? Matrix inversion has some nasty numerical properties that other methods overcome, and matrix inversion is also slower than most of these methods for some problem.
3. I've run this problem through R so you can see what the inverse of the matrix *should* be. Note that "small" numbers like -4.918979e-17 are zero to within the precision of the operations performed. Also note that I computed the inverse using a process that is more robust than a typical matrix inverse -- it's called the Moore-Penrose Generalized Inverse and is in the MASS library of R as function "ginv". "%*%" is how you do a matrix multiply in R.
> m
[,1] [,2] [,3]
[1,] 0.4177880 5.420376e-01 7.291423e-01
[2,] 0.0000000 6.123032e-17 1.000000e+00
[3,] -0.5420376 4.177880e-01 -2.558129e-17
> ginv(m)
[,1] [,2] [,3]
[1,] 8.920393e-01 -0.6504235 -1.157331e+00
[2,] 1.157331e+00 -0.8438587 8.920393e-01
[3,] -1.125944e-16 1.0000000 -3.150951e-16
> m%*%ginv(m)
[,1] [,2] [,3]
[1,] 1.000000e-00 4.857226e-16 -3.852509e-16
[2,] -4.173067e-17 1.000000e+00 -2.604753e-16
[3,] -4.049495e-17 -4.918979e-17 1.000000e-00
----------------------------------------------------------------------
You can respond by visiting:
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=9360&group_id=426