Gruff と Rails の問題に直面しています。サイトの例は次のように失敗します。
ZeroDivisionError: divided by 0
from /home/prikha/.rvm/gems/ruby-1.9.3-p194@rubymine/gems/gruff-0.3.6/lib/gruff/base.rb:1066:in `label'
from /home/prikha/.rvm/gems/ruby-1.9.3-p194@rubymine/gems/gruff-0.3.6/lib/gruff/base.rb:590:in `setup_graph_measurements'
from /home/prikha/.rvm/gems/ruby-1.9.3-p194@rubymine/gems/gruff-0.3.6/lib/gruff/base.rb:532:in `setup_drawing'
from /home/prikha/.rvm/gems/ruby-1.9.3-p194@rubymine/gems/gruff-0.3.6/lib/gruff/base.rb:508:in `draw'
from /home/prikha/.rvm/gems/ruby-1.9.3-p194@rubymine/gems/gruff-0.3.6/lib/gruff/line.rb:53:in `draw'
from /home/prikha/.rvm/gems/ruby-1.9.3-p194@rubymine/gems/gruff-0.3.6/lib/gruff/base.rb:487:in `write'
from (irb):8
from /home/prikha/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>'