Hi all, I wrote two new method for exchange 2 row (2 columns) in a
matrix:


class Matrix
     def exchange_rows(i,j)
  a = Matrix.rows(@rows) # matrice originale
  b = a.clone() # matrice di servizio
  for k in 0...a.column_size
    a[i,k] = b[j,k]
    a[j,k] = b[i,k]
  end
  return a
  end

  def exchange_columns(i,j)
  a = Matrix.rows(@rows) # matrice originale
  b = a.clone() # matrice di servizio
  for k in 0...a.row_size
    a[k,i] = b[k,j]
    a[k,j] = b[k,i]
  end
  return a
end


I hope it is usefull to you....

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