sim function

sim.rb

# That's a lambda in case you haven't seen this yet: https://blog.honeybadger.io/using-lambdas-in-ruby/
# def sim()... would also work but without an object an functional style (using a lambda) is more idiomatic.
sim ->(matrix, base_line, compare_to) do
  # -> TODO
end

matrix = Matrix[ # See https://ruby-doc.org/stdlib-2.5.1/libdoc/matrix/rdoc/Matrix.html
  [1, nil, 3, nil, nil, 5, nil, nil, 5, nil, 4 nil], # first row
  [] # second row and so on
]

assert_equal -0.18, sim(matrix,1 ,2)
assert_equal -0.59, sim(matrix,1 ,6)