Hesabu

Hesabu : equations solver relies on https://github.com/BLSQ/go-hesabu to solve equations

Hesabu is swahili word for arithmetic.

sample usage

    solver = Hesabu::Solver.new
    solver.add("c", "a + b")
    solver.add("a", "10")
    solver.add("b", "10 + a")

    solution = solver.solve!

    expect(solution).to eq("a" => 10, "b" => 20, "c" => 30)

The solver will deduce the correct order and find the values of a,b and c.

The expressions can be more complex (excel like), see the supported functions here

When parsing or solving, things can go wrong, here are various cases

Currently the solver :

• is case sensitive.
• and fast (32000 equations in 3 seconds)

Alternatives

• https://github.com/rubysolo/dentaku more complete, currently less performant.

Development

Running the tests

# only the fast
bundle exec rspec --tag ~slow
# all with integration test, expect around 30-40 seconds depending on your machine
bundle exec rspec

profiling

RUBY_PROF_MEASURE_MODE=wall PROF=true bundle exec rspec ./spec/lib/hesabu/integration_spec.rb
RUBY_PROF_MEASURE_MODE=allocations PROF=true bundle exec rspec ./spec/lib/hesabu/integration_spec.rb

then look at the numbers launch the complete test suite and verify timings before and after

deployment to rubygems.org

one time setup

gem install gem-release
curl -u rubygemaccount https://rubygems.org/api/v1/api_key.yaml > ~/.gem/credentials
chmod 0600 ~/.gem/credentials

gem bump --tag --release

License

The gem is available as open source under the terms of the MIT License.