From: Rob Redmon <rob.webinator@...>
Date: 2009-08-29T20:47:32+09:00
Subject: gnuplot line color

How do I choose the color used to make a gnuplot?

I'm doing something like:
    def plot( output )
        require 'gnuplot'
        Gnuplot.open do |gp|
            Gnuplot::Plot.new( gp ) do |plot|

                if ( output )
                    plot.terminal "png small"
                    plot.output "#{output}"
                    plot.pointsize 1
                end

#                plot.xrange "[#{@obs_times[0].to_s.gsub("T"," ")} to
#{@obs_times[0].to_s.gsub("T"," ")}]"
#                plot.xrange
"[\"2009-01-01T00:00:00+00:00\":\"2009-01-01T23:59:00+00:00\"]"
                plot.title  "#{@header["element"].gsub("'","p")}"
                plot.ylabel "#{@header["element"].gsub("'","p")}
[#{@header["units"]}]"
                plot.xlabel "time: #{@obs_times.first} -
#{@obs_times.last}"
#                plot.data << Gnuplot::DataSet.new( [ @obs_times, @data
] ) do |ds|
                plot.data << Gnuplot::DataSet.new( [ @data ] ) do |ds|
                    ds.with = "lines"
                    ds.linewidth = 2
                    ds.notitle
                end
                plot.data << Gnuplot::DataSet.new( [ @data ] ) do |ds|
                    ds.with = "points"
                    ds.notitle
                end
                plot.grid
            end
        end
    end

Presently this produces a plot that has green points on top of red line:
http://ngdc.noaa.gov/stp/IONO/ionosonde/MIDS/catalog/trends/BC840/BC840_fmin.png

I'd like to explicitly specify the colors and produce a black line with
blue points.  How do I do that?
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