From: 7stud -- <dolgun@...>
Date: 2007-10-08T22:45:42+09:00
Subject: Re: MATRIX PROBLEMS (AGAIN!)

John Nott wrote:
>

This code

file = File.new("data.txt")
fields = []

while (!file.eof)
  line = file.gets
  line.each(',') do |this_field|
    fields << this_field.chomp(",").strip()
  end
end

p fields

with this file:

data.txt:
10, 20, 30
40, 50, 60

produces this array:

-->["10", "20", "30", "40", "50", "60"]

(note that they are strings)

But that is poorly written code; I can see that you copied it off the OT 
website.  Instead, you can write something like this:

results = []

File.open("data.txt") do |file|
  file.each_line(',') do |field|
      results << field.to_i
  end
end

p results
-->[10, 20, 30, 50, 60]

But then, it's not clear why you even need a results array.  Instead, 
why not just insert each field straight into your matrix?

Also, in this code:

r = 1
n = 0
c = 1

line.each(',') { |this_record|
fields << this_record.chomp(",").strip()
  mat1[r,c] = fields[r,c]
  c=c+1
  n=n+1

1) the variable this_record will actually be assigned a string like '3,' 
so it's not a record--it's one field.

2) The value for r never changes.






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