Re: Date Time help

Agrapha <agrapha@xxxxxxxxx> wrote:

> I need a line graph with a moving window of time on the x-axis.

And who's going to cut one day's worth of data out of the (supposedly
larger data stream? IOW, who will be moving the window?

> So my difficulty is the 00 hour which moves thru the day depending on
> the hour we look at the data.

Not really. Your key difficulty is that your data file contains
information which you're not telling gnuplot to use: the date. You
need to present it with data that actually makes a difference between
15:00 today and 15:00 yesterday --- IOW, you need the date.

Read 'help time/date' and the sections it points you to, again, then
craft a timefmt setting that will read both the time and the date from
your file. You may have to adjust the file format a bit (get rid of
those pesky AM/PM hours), but other than that, it should just work.
Then

set format x "%H"

will put just the hour on the ticks, and yes, that will jump back from
23 to 0 at midnight.

> I have read the time/date help section but because of the moving
> window of hours I didn't see a clear way to plot the data.

I think you're failing to see the forest because you're staring too at
a single tree too much. The trick is that you need to get more
information than just the hour into gnuplot.

The only other option I see would be to forge the xtics manually,
ignoring the hour data in the file:

set xtics ('15' 0, '16' 1, ..., '15' 24)
plot 'data' using 5


--
Hans-Bernhard Broeker (broeker@xxxxxxxxxxxxxxxxxxxxx)
Even if all the snow were burnt, ashes would remain.
.

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