From: Rob Redmon <rob.webinator@...>
Date: 2009-04-23T07:02:52+09:00
Subject: Re: gnuplot timeseries

Phlip wrote:
>> # causes error               plot.xrange
>> "[\"2009-01-01T00:00:00+00:00\":\"2009-01-01T23:59:00+00:00\"]"
> 
> I'm not sure where the +00:00 comes from.

That's the default format of DateTime.new.to_s

> 
> This post...
> 
>   http://www.oreillynet.com/ruby/blog/2008/03/cruisecontrol_charts.html
> 
> ...shows how to format the time and build a range:
> 
> def timefmt;  '%Y/%d/%m-%H:%M';  end
> 
> def fetch_codelines(stat, fields)
>   return stat.values_at(*fields).map{|values| values['codelines'] }.sum
> end
> 
> def ftime(timestamp)
>   Time.at(timestamp).strftime(timefmt)
> end
> ...
> plot.xrange "['#{ ftime(mini) }':'#{ ftime(maxi) }']"
> 
> I admit the documentation on that technique, in both Gnuplot.rb and 
> gnuplot,
> are very scarce!

Thanks for the ideas.  Ruby originated gnuplot examples are so scarce 
that I've been looking (in vain) for another package that as lightweight 
but better documented.
-- 
Posted via http://www.ruby-forum.com/.