[Gnuplot-info] Error: "all points y value undefined!"

[gnu-jeff <gnu...@sp...>]

Hi.  I'm using  gnuplot 4.0 patchlevel 0, and running into a problem.

When running, I get an error message:

gnuplot> plot 'g.csv' using 1:2 title 'Series1' with lines 2, '' using 1:3
title 'Series 2' with lines 3
                         ^
         "g.pcmd", line 12: all points y value undefined!


This is because all of the data values happen to be zero for this particular
graph

My source data is:
20071022_133502,0,0
20071022_135003,0,0
20071022_140502,0,0
20071022_142008,0,0


and I'm running gnuplot with:
set terminal png small
set timestamp
set datafile separator ","
set output 'g.png'
set ylabel "YY"
set format y "%.0f"
set xdata time
set timefmt "%Y%m%d_%H%M%S"
set format x "%b %d\n%H:%M"
set logscale y
set title "Title"
plot 'g.csv' using 1:2 title 'Series1' with lines 2, '' using 1:3 title
'Series 2' with lines 3


What can be done to allow this to work when all of the data points are the
same?

If they're all the same value but non-zero, gnuplot only gives a warning; 
  Warning: empty y range [1:1], adjusting to [0.99:1.01]

Thanks,

Jeff



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