Module: NMatrix::MagicHelpers

Defined in:
lib/nmatrix/shortcuts.rb

Overview

Methods for generating magic matrix.

Class Method Summary collapse

Class Method Details

.doubly_even_magic(nm, shape) ⇒ Object 



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# File 'lib/nmatrix/shortcuts.rb', line 55

def doubly_even_magic(nm, shape)
  mini_square_num = shape / 4
  count = 1     
  inv_count = shape * shape
  shape.times do |row|
    shape.times do |col|
      if col >= mini_square_num and col < shape - mini_square_num
        if row >= mini_square_num and row < shape - mini_square_num
	        nm[row,col] = count
        else 
          nm[row,col] = inv_count
        end
      elsif row < mini_square_num or row >= shape - mini_square_num
        nm[row,col] = count
      else
        nm[row,col] = inv_count
      end
      count += 1
      inv_count -= 1  
    end
  end
end

.odd_magic(nm, shape) ⇒ Object 



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# File 'lib/nmatrix/shortcuts.rb', line 40

def odd_magic(nm, shape)
  row = shape - 1
  col = shape / 2       
  nm[row,col] = 1
  (2..shape * shape).each do |index|
    if nm[(row + 1) % shape,(col + 1) % shape] == 0
      row = (row + 1) % shape
      col = (col + 1) % shape
    else
      row = (row - 1 + shape) % shape
    end
      nm[row,col] = index
  end
end

.singly_even_magic(nm, shape) ⇒ Object 



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# File 'lib/nmatrix/shortcuts.rb', line 78

def singly_even_magic(nm, shape)
  half_shape = shape / 2
  complementary_pair = (shape - 2) / 4
  swap_col = NMatrix.new([shape])
  index = 0 
  mini_magic = NMatrix.new([half_shape,half_shape], 0, dtype: nm.dtype)
  odd_magic mini_magic, half_shape
  half_shape.times do |row|
    half_shape.times do |col|
      nm[row,col] = mini_magic[row,col]  	
      nm[row + half_shape,col + half_shape] = mini_magic[row,col] + half_shape * half_shape  
      nm[row,col + half_shape] = mini_magic[row,col] + 2 * half_shape * half_shape      
      nm[row + half_shape,col] = mini_magic[row,col] + 3 * half_shape * half_shape       
    end  
  end
  
  (1..complementary_pair).each do |complementary_entry|
    swap_col[index] = complementary_entry
    index += 1
  end

  (shape - complementary_pair + 2..shape).each do |center|
    swap_col[index] = center
    index += 1
  end 

  (1..half_shape).each do |row|
    (1..index).each do |col|
      temp = nm[row - 1,swap_col[col - 1] - 1]
      nm[row - 1,swap_col[col - 1] - 1] = nm[row + half_shape - 1,swap_col[col - 1] - 1]
      nm[row + half_shape - 1,swap_col[col - 1] - 1] = temp
    end
  end

  temp = nm[complementary_pair,0] 
  nm[complementary_pair,0] = nm[complementary_pair + half_shape,0] 
  nm[complementary_pair + half_shape,0] = temp

  temp = nm[complementary_pair + half_shape,complementary_pair]
  nm[complementary_pair + half_shape,complementary_pair] = nm[complementary_pair,complementary_pair] 
  nm[complementary_pair,complementary_pair] = temp
end