[#387246] newbie question — sunny parker <info@2020proj.com>

i am coming from php and dont seem to quite understand how ruby works

13 messages 2011/09/01

[#387330] installing naive bayes classifier — aya abdelsalam <ayoya_91@...>

Hello

10 messages 2011/09/02

[#387344] Beginner needing help - Writing right-angle triangle program — Kane Williams <theburrick@...>

I've been going through a Haskell tutorial (Just to see what it's like)

12 messages 2011/09/03

[#387356] Which version should I download? — Vladimir Van Bauenhoffer <cluny_gisslaren@...>

Im new to programming and Im thinking of downloading and starting with

17 messages 2011/09/03

[#387392] loops problem — jack jones <shehio_22@...>

for (j = @array.length ; j > counter ; j = j-1) # counter is a variable

13 messages 2011/09/04

[#387469] posts on Unix systems programming — Eric Wong <normalperson@...>

I would like to do a series of mailing list posts on the subject of Unix

28 messages 2011/09/06

[#387530] Unexpected behavior of Ruby array — Suvankar Satpati <suvankar.17@...>

I was going through the exercises at http://rubykoans.com/ and got

11 messages 2011/09/08

[#387544] Executing the output of a look — dwight schrute <spambocks@...>

Hi,

14 messages 2011/09/08

[#387586] Creating a hash from two arrays — simon harrison <simonharrison.uk@...>

Hi. Can anyone help with this? I'd like to end with a hash like so:

15 messages 2011/09/09

[#387596] newbie ruby installation malloc issue — "mark e." <mark_f_edwards@...>

hi all -

12 messages 2011/09/09

[#387614] how to write data in binary to a file? — frank hi <yw_hi@163.com>

Hi,

11 messages 2011/09/10

[#387646] How do I make output generate a float without an excess numbers of decimal places? — Kane Williams <theburrick@...>

For example, my current code is

11 messages 2011/09/11

[#387725] Any downsides to writing paranthesises? — Vladimir Van Bauenhoffer <cluny_gisslaren@...>

Im a newbie programmer who is trying to learn Ruby after having just

18 messages 2011/09/12

[#387811] Get interpreter path — Michal Suchanek <hramrach@...>

Hello,

26 messages 2011/09/14
[#387842] Re: Get interpreter path — Phillip Gawlowski <cmdjackryan@...> 2011/09/14

On Wed, Sep 14, 2011 at 3:35 PM, Michal Suchanek <hramrach@centrum.cz> wrot=

[#387844] Re: Get interpreter path — Michal Suchanek <hramrach@...> 2011/09/14

On 14 September 2011 20:47, Phillip Gawlowski <cmdjackryan@gmail.com> wrote:

[#387814] Tough Ruby Homework — Rory Pascua <rorypascua@...>

I'm trying to take a long piece of text, find a word, and get that word

18 messages 2011/09/14

[#387853] Can I Safely Use Rubinius While Learning? — Aaron Jackson <jacksonaaronc@...>

Greetings,

18 messages 2011/09/15

[#387915] Some newbie questions — Vladimir Van Bauenhoffer <cluny_gisslaren@...>

I got some newbie questions which I would very much appreciate if

14 messages 2011/09/15

[#388003] Ruby Speed Question — Kevin Anon <oblivious.sage@...>

Wrote my first Ruby program recently for a class assignment where we had

12 messages 2011/09/18

[#388078] appending \n to each element in an array — Joe Collins <joec_49@...>

I have an array

13 messages 2011/09/20

[#388123] Turning on a special program at special time and turning off the computer at another special time — "amir e." <aef1370@...>

I decided to write a program in RUBY wherein these items have been done

11 messages 2011/09/21
[#388124] Re: Turning on a special program at special time and turning off the computer at another special time — andrew mcelroy <sophrinix@...> 2011/09/21

That sounds like a program a special program a terrorist would write. Are

[#388198] Conditional statements with multiple arguments — "Thomas B." <sinixlol@...>

Good afternoon everyone,

18 messages 2011/09/24

[#388203] Ruby 1.9.3 RC1 is out — "Yuki Sonoda (Yugui)" <yugui@...>

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19 messages 2011/09/24
[#388208] Re: [ANN] Ruby 1.9.3 RC1 is out — Quintus <sutniuq@...> 2011/09/24

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[#388209] Re: [ANN] Ruby 1.9.3 RC1 is out — Chris White <cwprogram@...> 2011/09/24

[#388214] Re: [ANN] Ruby 1.9.3 RC1 is out — Quintus <sutniuq@...> 2011/09/24

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[#388216] Re: [ANN] Ruby 1.9.3 RC1 is out — Yusuke Endoh <mame@...> 2011/09/24

Hello,

[#388248] Looking for better/familiar approach to command line opts — "Perl J." <perljunkie@...>

So I guess the warning to the reader upfront is... I'm a bit of a Perl

14 messages 2011/09/25

[#388333] Get all classes from a list of files — Jeroen van Ingen <jeroeningen@...>

I have a list of ruby files. I would like to create objects from all

11 messages 2011/09/28

[#388342] Ruby Syntax @keywords ||= [ ] — Bhavesh Sharma <sharmabhavesh@...>

Sorry if this comes across as a dumb question, but what does the

11 messages 2011/09/28

[#388366] IO.readlines will not accept variable with file name Why? — Joda jenson <jodajen2@...>

I am fairly new to Ruby and I am stuck on this. Would someone have a

13 messages 2011/09/29
[#388368] Re: IO.readlines will not accept variable with file name Why? — Robert Klemme <shortcutter@...> 2011/09/29

On Thu, Sep 29, 2011 at 11:14 AM, Joda jenson <jodajen2@yahoo.com> wrote:

Re: how to write data in binary to a file?

From: Robert Klemme <shortcutter@...>
Date: 2011-09-12 11:20:56 UTC
List: ruby-talk #387703
On Sun, Sep 11, 2011 at 5:15 AM, Brian Candler <b.candler@pobox.com> wrote:
> Phillip Gawlowski wrote in post #1021166:
>> On Sat, Sep 10, 2011 at 6:52 PM, Brian Candler <b.candler@pobox.com>
>> wrote:
>>> irb(main):005:0> f2.write("gro")
>>> =3D> 5
>>>
>>> Normally, transcoding a UTF-8 string (which contains non-ASCII
>>> characters) to ASCII-8BIT would raise an exception:
>>
>> You obviously aren't aware what Extended ASCII (aka ASCII 8bit) is.
>
> I'm not? Then please explain it to me. What I know so far about ruby 1.9
> encoding I have documented at
> https://github.com/candlerb/string19/blob/master/string19.rb

irb(main):001:0> u=3DEncoding::BINARY
=3D> #<Encoding:ASCII-8BIT>
irb(main):002:0> u.names
=3D> ["ASCII-8BIT", "BINARY"]

In other words: binary and ASCII-8BIT are the same.

I find the behavior totally consistent: when writing a String with
*any* encoding to BINARY then simply bytes are dumped as is and _no
conversion_ is done.  So there cannot be an encoding error.

irb(main):003:0> s=3D"gro=DF"
=3D> "gro=DF"
irb(main):004:0> s.size
=3D> 4
irb(main):005:0> s.bytesize
=3D> 5
irb(main):006:0> s.encoding
=3D> #<Encoding:UTF-8>
irb(main):007:0> File.open("x","wb"){|io| p io.external_encoding,
io.internal_encoding ; io.write(s)}
#<Encoding:ASCII-8BIT>
nil
=3D> 5
irb(main):008:0> File.stat("x").size
=3D> 5

Now I can read the file with encoding UTF-8 properly:

irb(main):009:0> t =3D File.open("x","r:UTF-8") {|io| io.read}
=3D> "gro=DF"
irb(main):010:0> t.size
=3D> 4
irb(main):011:0> t.bytesize
=3D> 5
irb(main):012:0> t.encoding
=3D> #<Encoding:UTF-8>
irb(main):013:0> s =3D=3D t
=3D> true

> Now, if you open a file for write and set an external encoding (the
> default is nil) it means "transcode to this encoding". But for some
> reason, setting external encoding to ASCII-8BIT bypasses this rule.

See above.  The name ASCII-8BIT is probably not the best one to choose
for this but if you think about it as BINARY then everything fits
nicely together.

Kind regards

robert

--=20
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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