Re: [Gnuplot-info] re ading stdin twice & fix xtics to nonfix time

[Thomas S. <t.s...@fz...>]

1.)

see
http://www.gnuplot.info/docs/node131.html

plot '-', '-'
     2
     4
     6
     e
     10
     12
     14
     e

2.)
see if setting the xtics increment to 3 h (in seconds) works:

set xtics 3*60*60


FastCatch wrote:
> 
> Hi, there
> 
> I need to create a chart with gnuplot -- it's for a datetime-avg-max data
> series from a device.  I can do it pretty well except for two issues:
> 
> 1. The data is available via the stdin as the output of a php script.  My
> charting needs two plots (one for the avg and one for the max values).  If
> I plot against '-' twice gnuplot wants me to input the sequence twice and
> I'm not sure how to do it with a piped input (where does the first one
> end?).  Question: is there a way to use the same stdin sequence twice just
> the same way as normal data files?
> 
> Alternatives I see:
> I have come up with an approximately OK result using boxerrorlines which
> only requires one go but I'd only use it as a fallback option if there's
> no sensible solution to the issue above.
> Another option is to put the data into a (temp) file but I'd prefer to
> avoid it.
> 
> 2. The data stream is for the last X hours (minutes, whatever); let's say
> the last 24 hours.  I'd like to set xtics at every three hours (e.g.
> "21:00, "0:00", "3:00", "6:00", etc.) -- but as I'm not sure what time the
> first (earliest) entry contains I just cannot set it up.  What is the
> right way to do it?
> 
> Thanks in advance.
> 

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