Hello Team,
On my quest to learn Ruby, I implemented a known algorithm to solve an odd
nXn magic square.
I tested my code using a 3x3 and a 5x5 magic squares.
The problem that I am having is that I hard-code the initialization matrix.
In other words, if it is a 3x3 I define:
mm = [[0, 0, 0], [0, 0, 0], [0, 0, 0]]
For a 5 x 5 I define :
mm = [[0,0,0, 0, 0], [0,0,0, 0, 0], [0,0,0, 0, 0],[0,0,0,0,0],[0,0,0,0,0]]
I want to be able to solve any size odd magic square. To do so, I need to be
able to define my matrix dynamically and on demand.
Can anyone tell me how to do that?
Attached is my current code. Please feel free to criticize it and make
recommendations. My disclaimer: I am a Ruby apprentice.
Thank you
Victor
#!/usr/local/bin/ruby -d -W0
def mag(size)
r = 0 # row
c = 0 # column
index = 0 # pointer
# mm = [[0, 0, 0], [0, 0, 0], [0, 0, 0]]
mm = [[0,0,0, 0, 0], [0,0,0, 0, 0], [0,0,0, 0,
0],[0,0,0,0,0],[0,0,0,0,0]]
maxLoop = size * size # Magic Square size
1.upto(maxLoop) do |n|
case
when n == 1
c = (size / 2).floor # Will keep the
integer part, giving us the center in row 0
mm[c][r] = n # This is: mm[c][0]
when index >= size
index = 0
r = r + 1
mm[c][r] = n
puts " "
else
c = c + 1
if c >= size
c = 0
end
r = r -1
if r < 0
r = size - 1
end
mm[c][r] = n
end
index = index + 1
puts "[#{c}][#{r}] = #{mm[c][r]} "
end # End upto
···
##############
# Output the matrix #
##############
puts
0.upto(size -1) do |r|
0.upto(size -1) do |c|
print "#{mm[c][r]} "
end
puts " "
end
end # End method mag
# We start here
p1 = ARGV[0].to_i
mag( p1 )
