[Gnuplot-info] Ignore data file with no valid points

[Paul B. <pb...@gm...>]

Hi,
i would like to plot some data from a data aquisition system. If a sensor breaks or data validation fails it will output a value of -9999.99.

Plots work fine, except when i have only -9999.99 values in a column. Then i get the following errors:
"def.gnuplot", line 9: warning: Skipping data file with no valid points
"def.gnuplot", line 9: all points y value undefined!
The script stops leaving the following plots undone.
Is there any way to ignore those warnings and force gnuplot to print an empty plot? I think there were no warnings in former versions of gnuplot.

I tried the folowing script on gnuplot 4.0 (solaris) and 4.2 (OSX)

set terminal png small size 550,310
set xdata time
set datafile missing "-9999.99"
set timefmt '%H%M%S'
set format x '%H:%M'
set xrange
set output '/foo/1.png'
plot '/foo/foo.data' using 1:3 with lines lw 2
set output '/foo/2.png'
plot '/foo/foo.data' using 1:2 with lines ls 1

data file:
000000 1 -9999.99
000100 2 -9999.99
000200 3 -9999.99
000300 4 -9999.99
000400 5 -9999.99
000500 6 -9999.99 
000600 7 -9999.99
000700 8 -9999.99
000800 9 -9999.99
000900 10 -9999.99

Thanks Paul