[#7500] Re: how to introduce reference objects into ruby — "Geert Fannes" <Geert.Fannes@...>

The problem with the code you sent is that you have to go through ALL

16 messages 2006/03/10

[#7553] "not" operator used in expression that is a method parameter can generate syntax error — noreply@...

Bugs item #3843, was opened at 2006-03-15 22:09

27 messages 2006/03/16
[#7554] Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error — nobu@... 2006/03/16

Hi,

[#7557] Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error — 卜部昌平 <shyouhei@...> 2006/03/16

Nobu, you are not answering to the question.... You have to unveil why

[#7559] Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error — Yukihiro Matsumoto <matz@...> 2006/03/16

Hi,

[#7560] Rant about keyword logical operators was : (Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error) — "Zev Blut" <rubyzbibd@...> 2006/03/16

Hello,

[#7565] Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error — mathew <meta@...> 2006/03/16

Yukihiro Matsumoto wrote:

[#7566] Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error — "Brian Mitchell" <binary42@...> 2006/03/16

On 3/16/06, mathew <meta@pobox.com> wrote:

[#7567] Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error — mathew <meta@...> 2006/03/16

Brian Mitchell wrote:

[#7568] Re: [ ruby-Bugs-3843 ] "not" operator used in expression that is a method parameter can generate syntax error — "Brian Mitchell" <binary42@...> 2006/03/16

On 3/16/06, mathew <meta@pobox.com> wrote:

[#7614] PATCH: A subclassable Pathname — "Evan Phoenix" <evanwebb@...>

A simply change (changing all references of "Pathname.new" to

19 messages 2006/03/27
[#7618] Re: PATCH: A subclassable Pathname — Tanaka Akira <akr@...17n.org> 2006/03/27

In article <92f5f81d0603262350k796fe48fp2224b9f2108ac507@mail.gmail.com>,

[#7619] Re: PATCH: A subclassable Pathname — "Evan Phoenix" <evan@...> 2006/03/27

Quite right on the .glob and .getwd. I guess the tests don't test hit

[#7620] Re: PATCH: A subclassable Pathname — Tanaka Akira <akr@...17n.org> 2006/03/27

In article <92f5f81d0603270903g2fb02244i6a395be708dfffa3@mail.gmail.com>,

Re: how to introduce reference objects into ruby

From: mathew <meta@...>
Date: 2006-03-13 21:00:06 UTC
List: ruby-core #7537
Geert Fannes wrote:
> The problem with the code you sent is that you have to go through ALL
> your matrix elements to get a certain row or column, which takes too
> long. Remember that this is a LARGE matrix (my current C implementation
> can handle 100M row and cols and 800M elements).

Well, consider that in a perfect world with zero storage overhead, you'd 
be looking at 4 bytes for the row, 4 bytes for the column, 8 bytes for a 
float, multiply by 800M elements active in your sparse array and by my 
calculations you've got 12GB of data before you even start hashing anything.

Given that size of problem, I'd be strongly inclined to move it out of 
RAM into a relational database. Especially if you want to be able to 
iterate along any row or column, as you apparently do. In which case, 
you might as well use Ruby :-)


mathew

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