From: Rob Redmon <rob.webinator@...>
Date: 2009-04-23T06:16:35+09:00
Subject: gnuplot timeseries

Does anyone have an example of plotting a timeseries with gnuplot and
setting the xrange?  Why doesn't the following snippet work as expected?
It produces the attached.

require 'rubygems'
require 'gnuplot'
require 'date'
obs_times = Array.new
data = Array.new
24.times { |h| obs_times << DateTime.new( 2009, 1, 1, h ); data <<
rand() }
# doesn't work either
#        24.times { |h| obs_times << "2009-1-1 #{h}:00:00"; data <<
rand() }

Gnuplot.open do |gp|
    Gnuplot::Plot.new( gp ) do |plot|

# causes error               plot.xrange
"[\"2009-01-01T00:00:00+00:00\":\"2009-01-01T23:59:00+00:00\"]"
        plot.data << Gnuplot::DataSet.new( [ obs_times, data ] ) do |ds|
            ds.with = "points"
            ds.linewidth = 4
        end
    end
end

Attachments:
http://www.ruby-forum.com/attachment/3609/Picture_1.png

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