Plotting Tweets from DB in Ruby, grouping by hour.
- by plotti
Hey guys I've got a couple of issues with my code.
I was wondering that I am plotting
the results very ineffectively, since
the grouping by hour takes ages
the DB is very simple it contains the tweets, created date and username. It is fed by the twitter gardenhose.
Thanks for your help !
require 'rubygems'
require 'sequel'
require 'gnuplot'
DB = Sequel.sqlite("volcano.sqlite")
tweets = DB[:tweets]
def get_values(keyword,tweets)
my_tweets = tweets.filter(:text.like("%#{keyword}%"))
r = Hash.new
start = my_tweets.first[:created_at]
my_tweets.each do |t|
hour = ((t[:created_at]-start)/3600).round
r[hour] == nil ? r[hour] = 1 : r[hour] += 1
end
x = []
y = []
r.sort.each do |e|
x << e[0]
y << e[1]
end
[x,y]
end
keywords = ["iceland", "island", "vulkan", "volcano"]
values = {}
keywords.each do |k|
values[k] = get_values(k,tweets)
end
Gnuplot.open do |gp|
Gnuplot::Plot.new(gp) do |plot|
plot.terminal "png"
plot.output "volcano.png"
plot.data = []
values.each do |k,v|
plot.data << Gnuplot::DataSet.new([v[0],v[1]]){ |ds|
ds.with = "linespoints"
ds.title = k
}
end
end
end
