# A newbie question~ about 2 dimension hash? really appreciate~

I want to create a 2 dimension hash, and init it like
A B C D E
A 0 0 0 0 0
B 0 0 0 0 0
C 0 0 0 0 0
D 0 0 0 0 0
E 0 0 0 0 0

then I can set it by ARGV
for example, if ARGV is AB2, BC5, CD7,AE6,CA2, DB3,DE8, EA3, EC9
then the expect result is
A B C D E
A 0 2 0 0 6
B 0 0 5 0 0
C 2 0 0 7 0
D 0 3 0 0 8
E 3 0 9 0 0

well, I wrote some codes like this
#############################################
ALL=“A”…“E”
dimension={}
def init(dime)
tmp={}
ALL.each do |letter|
tmp[letter]=0
end
ALL.each do |letter|
dime[letter]=tmp
end
puts “Testing Init”
ALL.each do |key1|
ALL.each do |key2|
print key1+key2+" value="
puts dime[key1][key2]
end
end
print “Test init is over\n\n”
end
def test(array,dime)
array.each do |arr|
dime[arr[0].chr][arr[1].chr]=Integer(arr[2].chr)
end
puts “Testing”
ALL.each do |key1|
ALL.each do |key2|
print key1+key2+" value="
puts dime[key1][key2]
end
print “\n”
end
print “Test is over\n\n”
end

init(dimension)
test(ARGV, dimension)
#############################################
then the result will be

A  B  C  D  E

A 3 3 9 7 0
B 3 3 9 7 0
C 3 3 9 7 0
D 3 3 9 7 0
E 3 3 9 7 0

please tell me why i am wrong?
I thought the “last” decide the whole volume
like EC9 make C volume 9
EA3 make A volume 3
thank you so much~

On 10/4/07, [email protected] [email protected] wrote:

then the expect result is
dimension={}
ALL.each do |key2|
puts “Testing”
init(dimension)

please tell me why i am wrong?
I thought the “last” decide the whole volume
like EC9 make C volume 9
EA3 make A volume 3
thank you so much~

Sorry for not having more time right now but the pattern recalls shared
objects
when you do this

c> dime[letter]=tmp

in init you share all lines and they will always refer to the same
object.

try this and tell me if that solves your issue

c> dime[letter]=tmp.dup

HTH
Robert

2007/10/4, Robert D. [email protected]:

for example, if ARGV is AB2, BC5, CD7,AE6,CA2, DB3,DE8, EA3, EC9
ALL=“A”…“E”
ALL.each do |key1|
end

E 3 3 9 7 0
Sorry for not having more time right now but the pattern recalls shared objects
HTH
Robert

I guess you are right with regard to the aliasing effect.

Here’s another solution:

[email protected] /cygdrive/c/SCMws/RKlemme
\$ cat ~/ruby/matrix.rb
#!ruby
ALL=“A”…“E”
args = %w{AB2 BC5 CD7 AE6 CA2 DB3 DE8 EA3 EC9}
matrix = Hash.new 0
args.each do |a|
d1, d2, v = a.scan /./
matrix[[d1, d2]] = v.to_i
end

print " “, ALL.to_a.join(” "), “\n”
ALL.each do |d1|
print d1
ALL.each do |d2|
print " ", matrix[[d1,d2]]
end
print “\n”
end

require ‘pp’
pp matrix

[email protected] /cygdrive/c/SCMws/RKlemme
\$ ~/ruby/matrix.rb
A B C D E
A 0 2 0 0 6
B 0 0 5 0 0
C 2 0 0 7 0
D 0 3 0 0 8
E 3 0 9 0 0
{[“A”, “E”]=>6,
[“A”, “B”]=>2,
[“D”, “B”]=>3,
[“C”, “A”]=>2,
[“E”, “C”]=>9,
[“D”, “E”]=>8,
[“C”, “D”]=>7,
[“E”, “A”]=>3,
[“B”, “C”]=>5}

Kind regards

robert

On Oct 4, 5:56 pm, “Robert D.” [email protected] wrote:

then I can set it by ARGV
#############################################
puts “Testing Init”
dime[arr[0].chr][arr[1].chr]=Integer(arr[2].chr)
end
D 3 3 9 7 0
when you do this
Robert

what do I think about Ruby?http://ruby-smalltalk.blogspot.com/