Simulator
Use to easily create models and view results across periods.
Installation
Add this line to your application's Gemfile:
gem 'simulator'
And then execute:
$ bundle
Or install it yourself as:
$ gem install simulator
Usage
See the features for some examples.
bundle exec cucumber
See the specs for some simpler examples.
bundle exec rspec
See the examples subdirectory for examples as well. Including the one
excerpted below:
# We create a model that simulates a ball drop
model = Simulator::Model.new do
name = "Ball drop model"
# create a couple static variables to represent acceleration with
# default values
var :ax, 0
var :ay, - 9.8
# create dynamic variables bound to some computation, with default
# values.
# velocity is affected by acceleration
eqtn(:vx, 20) { vx + ax }
eqtn(:vy, 50) { vy + ay }
# position is affected by velocity
eqtn(:x, 10) { x + vx }
eqtn(:y, 100) { y + vy }
end
# Run the model 10 periods
model_run = model.new_run
10.times do
model_run.step
end
# retrieve the data
series = model_run.data.series :x, :y
puts series
# > [[30, 50, 70, 90, 110, 130, 150, 170, 190, 210, 210],
# > [140.2, 170.6, 191.2, 202.0, 203.0, 194.2, 175.6, 147.2, 108.99999999999999, 60.999999999999986, 60.999999999999986]]
# Then plot it or do whatever you like