Following along with "Beginning Ruby."

Ruby
1

I’m having trouble following along with some of the examples in this
"Beginning Ruby(2nd Edition). I’m at the section where you learn about
I/O handling and tried to do one of the examples and got an error. Not
sure what I did wrong:

irb(main):001:0> File.open(“olivertext.txt”) do |f|
irb(main):002:1* puts f.gets
irb(main):003:1> end
Errno::ENOENT: No such file or directory - olivertext.txt
from (irb):1:in initialize' from (irb):1:inopen’
from (irb):1
from C:/Ruby193/bin/irb:12:in `’

I tried to use the whole directory to find the file, and got this:

<“C:\Users\Al Baker\Documents\Programming\RuBy olivertext.txt”) do |f|
irb(main):005:1* puts f.gets
irb(main):006:1> end
Errno::ENOENT: No such file or directory -
C:UsersAlBakerDocumentsProgrammingRuBy olivertext.txt
from (irb):4:in initialize' from (irb):4:inopen’
from (irb):4
from C:/Ruby193/bin/irb:12:in `’
help!

2

Thanks. I wish they could’ve included that in the book.
I also had problems using the ‘Profile’ in irb. I used the code in the
book:

require ‘profile’
class Calculator
def self.count_to_large_number
x = 0
100000.times {x += 1 }
end

def self.count_to_small_number
x = 0
1000.times {x += 1 }
end
end
but only got ‘100000’ and ‘1000’ when I called the methods o for Small
and large number. smh!

3

try the second with ‘/’ instead of ‘’ path separator

4

I’m not sure profile gem works in IRB. Have you tried running it from an
.rb file?

5

I did. I got:

ruby profiletest.rb
% cumulative self self total
time seconds seconds calls ms/call ms/call name
0.00 0.00 0.00 1 0.00 0.00 Class#inherited
0.00 0.00 0.00 2 0.00 0.00
BasicObject#singleton_method_added
0.00 0.01 0.00 1 0.00 10.00 #toplevel
Exit code: 0

that’s all.

ALSO this code string doesn’t really do anything in a text analyzer
script I did.

lines = File.readlines(ARGV[0])

6

Al Baker wrote in post #1084630:

lines = File.readlines(ARGV[0])

  1. Do you know what ARGV contains?
  2. What name did you enter for ARGV[0]
  3. What is in the file that has the name given in 2)?
7

I tried to delete a directory that I created.

Dir.delete(“C:/Users/Al Baker/Documents/Programming/RuBy/NewDir”)

and got this:

Errno::EACCES: Permission denied - C:/Users/Al
Baker/Documents/Programming/RuBy/
NewDir
from (irb):62:in delete' from (irb):62 from C:/Ruby193/bin/irb:12:in’

8

Your code works for me when given an argument and a valid text
file. That means the problem is either your argument or your text file.

9

I have no clue. Here’s the script so far and how it supposed to work:

stopwords = %w{the a by on for are with just but and to the me I has
some in}
lines = File.readlines(ARGV[0])
line_count = lines.size
text = lines.join
total_characters = text.length
total_characters_nospaces = text.gsub(/\s+/,’’).length
word_count = text.split.length
sentence_count = text.split(/.|?|!/).length
paragraph_count = text.split(/\n\n/).length
all_words = text.scan(/\w+/)
good_words = all_words.select{|word| !stopwords.include?(word)}
good_percentage = ((good_words.length.to_f / all_words.length.to_f)
*100).to_i
sentences = text.gsub(/\s+/, ’ ').strip.split(/.|?|!/)
sentences_sorted = sentences.sort_by {|sentence| sentence.length}
one_third = sentences_sorted.length/3
ideal_sentences = sentences_sorted.slice(one_third, one_third +1)
ideal_sentneces = ideal_sentences.select {|sentence| sentence =~
/is|are/}

puts “#{line_count} lines”
puts “#{total_characters} characters”
puts “#{total_characters_nospaces} characters (excluding spaces)”
puts “#{word_count} words”

added Vowels in Text.(This part I added my self!!! :))

puts “#{text.scan(/[aeiou]/).length} vowels in text.”
puts “#{sentence_count} sentences”
puts “#{word_count / sentence_count} words per sentence (average)”
puts “#{paragraph_count} paragraph(s)”
puts “#{sentence_count / paragraph_count} sentences per paragraph
(average)”
puts “#{good_percentage}% of word are non-fluff words”
puts “Summary: \n\n” + ideal_sentences.join(". ")
puts “–End of analysis.”

10

Use FileUtils to delete entire folder/directory - Ruby itself will not
delete directory if files inside

11

Alex Mcmillan wrote in post #1084876:

Use FileUtils to delete entire folder/directory - Ruby itself will not
delete directory if files inside

what’s the method?

12

nvrmnd. i figured it out. thanks again. :slight_smile:

13

I’m havng trouble using mysql in my example.

i alreeady did the gem install and copied the “libmysql.dll” over to bin
but still got this:

irb(main):005:0> require ‘mysql’
LoadError: cannot load such file – mysql/mysql_api
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:i
n require' from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:i nrequire’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/mysql-2.9.0-x86-mingw32/lib/mys
ql.rb:6:in rescue in <top (required)>' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/mysql-2.9.0-x86-mingw32/lib/mys ql.rb:2:in<top (required)>’
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:i
n require' from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:i nrequire’
from (irb):5
from C:/Ruby193/bin/irb:12:in `’

any ideas?

14

Im just a beginer so what is everyone talking about?

15

Joey F. wrote in post #1085760:

Im just a beginer so what is everyone talking about?

I’m learning ruby by following along w/ a begnnner’s guide to the
language and some of the examples are a bit troublesome is all.