Re: Ruby code problem
- From: "Sean Murphy" <smurf_bp@xxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Tue, 15 Jan 2008 20:23:23 +1100
Hi,
thanks for the response. I found the problem in the original code. I was
not re-initialising the col array. The below code is how I should be doing
my example:
def make_2d_array n_row, n_col
Array.new(n_row) do
Array.new(n_col){ rand(2) }
end
end
make_2d_array(gets.to_i, gets.to_i)
The " Array.new(n_row) do
" creates the primary array and sets up a code block. Depending on the
number of elements I want to create for Row determines how many times the
code block is executed. The line which creates the col array, does the same
thing as previously described and executes the random method code block.
The value from the Random method is assigned to the new element for col.
Once all the columns are created, the col array is assigned to the row
array. Then the whole process is repeated until all the number of elements
defined to row have been created.
I hope this helps others and I didn't come up with the solution either. I
went to the Ruby mail list and receive a good answer from there.
Regards
Sean Murphy
Skype: smurf20005
Life is a challenge, treat it that way.
----- Original Message -----
From: "Jamal Mazrui" <empower@xxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Tuesday, January 15, 2008 3:22 AM
Subject: Re: Ruby code problem
Try moving the line
row = Array.new
below the line
while (counter_x < x)
I think the row array continued to grow instead of being re-initialized
for each column array. Each item in the column array contained a
reference to the same row array, so their values were the same.
Jamal
On Sun, 13 Jan 2008, Sean Murphy wrote:
Date: Sun, 13 Jan 2008 16:58:30 +1100
From: Sean Murphy <smurf_bp@xxxxxxxxxx>
Reply-To: programmingblind@xxxxxxxxxxxxx
To: programmingblind@xxxxxxxxxxxxx
Subject: Ruby code problem
All,
I am trying to create a two dimension array in Ruby. The books I have
referred two doesn't give me any examples on how to create a two
dimension
array by a programmatic way. They do talk about creating it by hard
code.
The below method is trying creates a 3 by 3 array with a random number
between 0 to 1.
def create_world x, y
col = Array.new
row = Array.new
counter_x = 0
counter_y = 0
while (counter_x < x)
puts 'x ' + counter_x.to_s.to_s
while (counter_y < y)
puts 'y ' + counter_y.to_s
map_type = rand(2)
puts 'Random: ' + map_type.to_s
row.push map_type
counter_y = counter_y + 1
end
col.push row
counter_y = 0
counter_x = counter_x + 1
end
return col
end
world = create_world(3, 3)
puts world.to_s
puts 'array ' + world[0].size.to_s
Problem with code above is:
1. I get 3 rows. But in each row I get 9 columns.
2. Each row content is the same.
So can anyone help with the above?
Regards
Sean Murphy
Skype: smurf20005
Life is a challenge, treat it that way.
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