ruby - How to subtract two sub-arrays from 2D array

Ruby - How to subtract two sub-arrays from 2D array

To subtract two sub-arrays from a 2D array in Ruby, you can iterate over the elements of the arrays and perform the subtraction operation element-wise. Here's a basic example:

# Example 2D array array_2d = [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ] # Sub-array to subtract sub_array1 = [1, 1, 1] sub_array2 = [2, 2, 2] # Subtraction operation result = array_2d.map.with_index do |row, i| row.map.with_index do |element, j| element - sub_array1[j] - sub_array2[j] end end # Display the result result.each { |row| p row }

In this example:

  • We have a 2D array array_2d.
  • We define two sub-arrays sub_array1 and sub_array2.
  • We use nested map methods to iterate over the rows and elements of the 2D array.
  • Within the inner map block, we perform the subtraction operation between each element of the 2D array and the corresponding elements of sub_array1 and sub_array2.
  • The result is stored in the result array.
  • Finally, we display the result.

Adjust the array_2d, sub_array1, and sub_array2 as needed for your specific use case.

Examples

  1. Ruby: Subtract two sub-arrays from a 2D array element-wise

    • Description: This query aims to subtract two sub-arrays element-wise from a 2D array in Ruby.
    • Code:
      array_2d = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] sub_array_1 = [1, 1, 1] sub_array_2 = [2, 2, 2] result_array = array_2d.map.with_index { |sub_array, i| sub_array.map.with_index { |element, j| element - sub_array_1[j] - sub_array_2[j] } }

  2. Ruby: Subtract sub-arrays using nested loops

    • Description: This query investigates subtracting two sub-arrays from a 2D array using nested loops in Ruby.
    • Code:
      array_2d = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] sub_array_1 = [1, 1, 1] sub_array_2 = [2, 2, 2] result_array = [] array_2d.each_with_index do |sub_array, i| temp_array = [] sub_array.each_with_index do |element, j| temp_array << (element - sub_array_1[j] - sub_array_2[j]) end result_array << temp_array end

  3. Ruby: Subtract sub-arrays using zip and map

    • Description: This query explores subtracting two sub-arrays from a 2D array using the zip and map methods in Ruby.
    • Code:
      array_2d = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] sub_array_1 = [1, 1, 1] sub_array_2 = [2, 2, 2] result_array = array_2d.map.with_index { |sub_array, i| sub_array.zip(sub_array_1, sub_array_2).map { |a, b, c| a - b - c } }

  4. Ruby: Subtract sub-arrays using transpose and map

    • Description: This query aims to subtract two sub-arrays from a 2D array using the transpose method and map in Ruby.
    • Code:
      array_2d = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] sub_array_1 = [1, 1, 1] sub_array_2 = [2, 2, 2] result_array = array_2d.transpose.map { |sub_array| sub_array.zip(sub_array_1, sub_array_2).map { |a, b, c| a - b - c } }.transpose

  5. Ruby: Subtract sub-arrays using matrix operations

    • Description: This query explores subtracting two sub-arrays from a 2D array using matrix operations in Ruby.
    • Code:
      require 'matrix' array_2d = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] sub_array_1 = [1, 1, 1] sub_array_2 = [2, 2, 2] result_array = Matrix.rows(array_2d) - Matrix.row_vector(sub_array_1) - Matrix.row_vector(sub_array_2)

  6. Ruby: Subtract sub-arrays using zip and inject

    • Description: This query investigates subtracting two sub-arrays from a 2D array using the zip method and inject in Ruby.
    • Code:
      array_2d = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] sub_array_1 = [1, 1, 1] sub_array_2 = [2, 2, 2] result_array = array_2d.map.with_index { |sub_array, i| sub_array.zip(sub_array_1, sub_array_2).inject([]) { |acc, (a, b, c)| acc << a - b - c } }

  7. Ruby: Subtract sub-arrays using map and flatten

    • Description: This query aims to subtract two sub-arrays from a 2D array using the map method and flattening the result in Ruby.
    • Code:
      array_2d = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] sub_array_1 = [1, 1, 1] sub_array_2 = [2, 2, 2] result_array = array_2d.map.with_index { |sub_array, i| sub_array.map.with_index { |element, j| element - sub_array_1[j] - sub_array_2[j] } }.flatten.each_slice(array_2d[0].size).to_a

  8. Ruby: Subtract sub-arrays using matrix subtraction

    • Description: This query explores subtracting two sub-arrays from a 2D array using matrix subtraction in Ruby.
    • Code:
      require 'matrix' array_2d = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] sub_array_1 = [1, 1, 1] sub_array_2 = [2, 2, 2] result_array = Matrix.rows(array_2d) - Matrix.row_vector(sub_array_1) - Matrix.row_vector(sub_array_2)

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