comp.lang.ruby Google Group

newbie question

2009-11-22T14:55:55Z

Hello
I noticed the following example somewhere
def mymethod(opts)
p opts
end
mymethod(:aaa => "something")
I'm wondering what this :aaa stands for. If I omit the
colon before the dummy aaa, it doesn't works.
Thanks for any hint/light.

Re: really crazy about this (do/while)

2009-11-22T14:49:46Z

Another possibility is using a small, but >0, epsilon and check if the
distance between the number and the limit is less than its value. Ruby
does this automatically for you, if you use its #step functions:
>> 98.3.step(98.6, 0.1).to_a
# => [98.3, 98.4, 98.5, 98.6]
>> 98.4.step(98.6, 0.1).to_a
# => [98.4, 98.5, 98.6]

Re: Pseudo array for Rails migration

2009-11-22T14:50:50Z

What stops you from doing
N_X = 20 # size of pseudo array
class CreatePeople < ActiveRecord::Migration
create_table :people do |t|
t.string :first_name , :null => false
.
.
.
N_X.times do |i|
t.integer(("x%02d" % i).to_sym)
end
t.timestamps

Re: really crazy about this (do/while)

2009-11-22T14:42:34Z

[Note: parts of this message were removed to make it a legal post.]
BigDecimal is probably easier to code with, but can kill performance as has
been mentioned previously. Recalling the old Fortran days, we always had a
constant called EPS we used in these kind of situations. EPS (short for
epsilon) was set to a small number, usually 1e-7. Anytime we needed to

Re: How to match and count

2009-11-22T14:45:50Z

The code above does not close the file handle properly. Also if can be
done shorter:
File.foreach "file.txt" do |line|
...
end
You can even use Ruby like awk which seems to be rarely done - but it's
possible.
Can be done like
ruby -nae 'BEGIN {$i=0}; $i+=1 if /something/ =~ $F[3]; END {puts $i}'

Re: Finding the closest value from a matrix

2009-11-22T14:42:04Z

Create a one-dimensional array where each entry records the value, row
and column number (or row and column headers).
Descriptor = Struct.new :row, :col, :value
a = [
Descriptor.new(0, 0, 1.183),
Descriptor.new(0, 1, 1.118),
Descriptor.new(0, 1, 1.006),
# ..etc.
]
a = a.sort_by{ |desc| desc.value }

Pseudo array for Rails migration

2009-11-22T14:06:02Z

Consider
N_X = 20 # size of pseudo array
class CreatePeople < ActiveRecord::Migration
create_table :people do |t|
t.string :first_name , :null => false
.
.
.
t.integer :x00
t.integer :x01
t.integer :x02
.
.
.
t.integer :x18

Re: COW-friendly Ruby 1.9?

2009-11-22T13:44:31Z

Hi,
In message "Re: COW-friendly Ruby 1.9?"
The REE patch made Ruby so slow on some non-Web cases. AuthorNari
made the faster patch. But it's still (much) slower than the original
GC for non forking programs. Besides that, the patch had the serious
bug which we could not identify for long time.
Ko1 is working on improvement on Ruby's memory management (not GC).

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2009-11-22T13:41:43Z

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OCR of PDF-documents using GData

2009-11-22T13:40:19Z

Hi,
Has anybody been able to perform OCR on a pdf document using GData?
[link]
Png and jpgs work fine after setting @client.version = '3' in
GData::Client::DocList but when I try pdf-files I get:
xmlns='[link]>

Re: confuse about initialize hash

2009-11-22T13:20:14Z

the hash options I saw in atom_feed , but it doesn't the last argument.
============================== ============================== ==
def atom_feed(options = {}, &block)
95: if options[:schema_date]
96: options[:schema_date] =
options[:schema_date].strftime ("%Y-%m-%d") if
options[:schema_date].respond_ to?(:strftime)

Re: where to find the help document?

2009-11-22T10:39:54Z

man ri

Re: Removing optional white space - doh! - refined

2009-11-22T10:33:06Z

Because it avoids accidentally doing the substitution of other text
which consists of two characters. Even if that text is not supposed to
appear in your input, using the explicit form helps documenting what's
intended. And the code is more robust: it will not break if the input
changes.
Cheers

Re: Same name for class and instance method

2009-11-22T10:29:25Z

Yes.
First of all, using the same name for a class and instance method can
cause confusion, so it's probably not a too good idea in the general
case. That doesn't mean that there aren't valid use cases for this though.
The way you seem to be using a block (definition of c is missing in your
example) is a bit unusual. Usually you would do

Re: where to find the help document?

2009-11-22T10:06:11Z

2009/11/22 nas <nasi...@googlemail.com>:
Thanks all.
So, is there a convenient way to check the usage of a function?
like unix's `man printf` or Perl's perldoc -f print
Regards.