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From: Ethan A Merritt <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: concatenating xticlabels and y-axis-formatting
Date: Tue, 30 Sep 2014 16:43:14 -0700
Organization: gnuplot development
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Bart Vandewoestyne wrote:

> In this graph, the Y-values represent timings.  Currently, the Y-labels
> are 'equally spaced', but are expressed in milliseconds.  I would like to
> make it easier to read/interpret for the user, and express the Y-labels in
> hours, minutes, seconds instead of milliseconds.

OK, I think I understand what you want.
There are number of changes needed to your script.

The bad news is - it doesn't work.
The good news is - it almost works.

I'll talk you through it, because some of the pieces work even
if the whole thing taken together triggers a bug.

1) gnuplot does time in seconds, not milliseconds, so...

   plot datafile using ($7/1000.)

2) to read the value as time-in-seconds on y

   set ydata time
   set timefmt y "%S"       # (version 5 accepts "%s" also)

3) to label the y axis in time units

   set format y "%H:%M:%.3S"

4) the first line of the file contains labels rather than data
   so we skip it in plotting:

   plot datafile skip 1 using ($7/1000.)

However there is a limitation and a bug.

The bug is that for some reason it loses the xticlabels(...)
while labelling the y axis in time units.  I'll add that to
the bug tracker.

The limitation is that gnuplot really thinks this is a date,
not a time, so the hours will wrap at 24.  There's already
a bug tracker item requesting a separate time mode to handle
time intervals rather than dates.

I'm reasonably sure both of these issues can be fixed before
version 5 is released, but I'm afraid you're out of luck
until then.

	Ethan