Allow nil in data passed to graphs

[v0dro]

Currently when I pass a nil in an Array for plotting, nyaplot returns an error.

It would be great if it could handle nils properly by not plotting the points where they appear, like GNU plot.

Here's some example code:

require 'nyaplot'

p = Nyaplot::Plot.new
p.add(:scatter, [10,nil,30], [0,1,2])
p.show
#ArgumentError: comparison of NilClass with 10 failed

[tansaku]

I seem to get this error even when I don't have a nil in the data - trying to do a boxplot, with more than one set of data ...

    puts dec2014
    puts '----'
    puts mar2015
    plot.add(:box, dec2014.compact, mar2015.compact)

gives

157.0
298
157.0
134.0
298
298
298
298
298
135.0
298
298
206.0
240.0
298
177.0
184.0
151.0
228.0
140.0
298
277.0
140.0
134.0
204.0
162.0
298
----
207.0
123.0
120.0
298
298
298
123.0
149.0
78.0
298
200.0
298
108.0
298
298
298
298
298
123.0
192.0
171.0
298
/Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/diagram.rb:285:in `each': comparison of NilClass with 78.0 failed (ArgumentError)
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/diagram.rb:285:in `min'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/diagram.rb:285:in `block in process_data'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/diagram.rb:290:in `call'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/diagram.rb:290:in `block in process_data'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/diagram.rb:290:in `each'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/diagram.rb:290:in `process_data'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/diagram.rb:16:in `initialize'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/plot.rb:75:in `new'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/plot.rb:75:in `add_with_df'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/nyaplot-0.1.6/lib/nyaplot/plot.rb:64:in `add'
    from lib/correlation.rb:127:in `block in <main>'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/statsample-2.0.1/lib/statsample/analysis/suite.rb:20:in `instance_eval'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/statsample-2.0.1/lib/statsample/analysis/suite.rb:20:in `run'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/statsample-2.0.1/lib/statsample/analysis.rb:73:in `block in add_to_reportbuilder'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/statsample-2.0.1/lib/statsample/analysis.rb:69:in `each'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/statsample-2.0.1/lib/statsample/analysis.rb:69:in `add_to_reportbuilder'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/statsample-2.0.1/lib/statsample/analysis.rb:91:in `to_text'
    from /Users/tansaku/.rvm/gems/ruby-2.2.3/gems/statsample-2.0.1/lib/statsample/analysis.rb:97:in `run_batch'
    from lib/correlation.rb:163:in `<main>'

[tansaku]

ah, because I have arrays of different lengths?

[domitry]

Oops that's true.. but it's bug.

[tansaku]

thanks @domitry - is there any quick fix I can do for this - was hoping to show some box plots at a presentation tomorrow :-) I guess I can get that via:

gem 'nyaplot', :git => 'git://github.com/domitry/nyaplot.git'

before it gets into the gem itself

[domitry]

moved to #57