I'm stumped, so I hope you don't mind my throwing this back at the list. It
was working with an older version of gnuplot, but using 4.4.2 now, I get
the same error as you.
The goal is to plot using a time/date x-axis, with an offset. Some
example code:
reset
set style data lines
unset key
set xdata time
set timefmt "%s"
delta=18000
# normally start/stop are parameters passed in
xstart=sprintf("%i", 1292736021-delta)
xstop=sprintf("%i", 1292742024-delta)
set xrange [xstart:xstop]
plot '-' using (timecolumn(1)-delta):2
1292734801 5169.53
1292736022 8.88
1292738354 9.03
1292739465 5117.24
1292740376 4935.53
1292740790 5498.60
1292740891 9.12
1292740992 9.10
1292741093 9.07
1292741194 4696.23
1292741406 5254.17
1292741507 5069.68
1292741608 9.02
1292741709 9.04
1292741810 10.85
1292741921 4820.72
1292742022 5054.15
1292742224 4875.13
e
This generates a "all points y value undefined!" error, and I don't
understand why. If the "set xrange" is removed, it seems to work fine. (But
of course, the limited range is needed for the intended application.) Can
anyone offer some help here?
> Still broken.
> Attached is revised code.
> ...
> gnuplot> plot s = 0, fl using (timecolumn(1)-delta):5 title
> "Elec. Power" axes x1y1 with lines, '' using
> (timecolumn(1)-delta):(cumP($5),s) title "Elec. Energy" axes x1y2
> with lines
> ^
> line 0: all points y value undefined!
> ...
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