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Plotting timeseries data #41
Description
How can timeseries data best be plotted using this gem?
When using
require 'gnuplot'
Gnuplot.open do |gp|
Gnuplot::Plot.new(gp) do |plot|
plot.xdata :time
plot.timefmt '"%s"'
plot.format 'x "%H:%m"'
plot.data << Gnuplot::DataSet.new( [[Time.now, Time.now + 60], [1, 2]] ) do |ds|
ds.with = "linespoints"
ds.title = "Howdy"
end
end
endthe errors I get are:
gnuplot> plot '-' title 'Howdy' with linespoints
^
line 0: Need full using spec for x time data
gnuplot> 2015-11-23 18:46:14 +0100 1
^
line 0: invalid command
gnuplot> 2015-11-23 18:47:14 +0100 2
^
line 0: invalid command
Workaround: add ds.using = '1:2' to the dataset.
Would it be better if this gem includes a default using for each dataset?
Activity
rdp commentedon Nov 25, 2015
there is a ds.using = is that what you're referring to? I think maybe you found the answer to your own question :)
wvengen commentedon Nov 26, 2015
Yes, using
ds.usingmakes it work. But wouldn't it be better if ruby-gnuplot would include this by default?rdp commentedon Dec 7, 2015
Hmm...I don't understand the internal workings enough of gnuplot to
understand this enough to know exactly what to do here. However, I will
definitely leave this thread up so that followers can use your tips to
figure it out, thank you!
On Thu, Nov 26, 2015 at 2:50 AM, wvengen notifications@github.com wrote:
sixtyfive commentedon Oct 31, 2020
Now, 5 years later, that same code only results in this for me:
Could that be due to the newer Gnuplot (5.2)?
rdp commentedon Nov 1, 2020
sixtyfive commentedon Nov 1, 2020
No, gnuplot supports timeseries data just fine. And as I understand the initial description of this Issue here, it also used to work with ruby_gnuplot, if only you didn't forget an appropriate
ds.using. That doesn't seem to be the case anymore though.rdp commentedon Nov 5, 2020