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?
