method

minor

v1_8_7_72 - Show latest stable - Class: Matrix

minor(*param)

public

Returns a section of the matrix. The parameters are either:

start_row, nrows, start_col, ncols; OR
col_range, row_range

  Matrix.diagonal(9, 5, -3).minor(0..1, 0..2)
    => 9 0 0
       0 5 0

# File lib/matrix.rb, line 342
  def minor(*param)
    case param.size
    when 2
      from_row = param[0].first
      size_row = param[0].end - from_row
      size_row += 1 unless param[0].exclude_end?
      from_col = param[1].first
      size_col = param[1].end - from_col
      size_col += 1 unless param[1].exclude_end?
    when 4
      from_row = param[0]
      size_row = param[1]
      from_col = param[2]
      size_col = param[3]
    else
      Matrix.Raise ArgumentError, param.inspect
    end
    
    rows = @rows[from_row, size_row].collect{
      |row|
      row[from_col, size_col]
    }
    Matrix.rows(rows, false)
  end

minor

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