#2410 Gnuplot > 5.2.2 stops plotting 0's...

[Anonymous]

Hello,

I've been using gnuplot for some time under FreeBSD 11.4. I noticed that output plots has changed when we migrated from gnuplot 5.2.2 release. I'm not sure what is the problem but it seems that no 0 points are potting after version 5.2.2. Thankfully I kept the 5.2.2 package (pkg create gnuplot) so I can show you the differences. I'm attaching 4 files.

gnuplot.file is the file that I send into gnuplot
inputdata.txt is the data file that I'm using

plot-wired_5.2.2.png is the output with gnuplot 5.2.2

plot-wired_5.4.0.png is the output with gnuplot 5.4.0

Can you shed light on why the 0 points are no longer being plotted with version 5.4.0?

[Ethan Merritt]

There is no such thing as zero on a log scale axis.
Plotting "with lines" cannot connect points that do not exist.
I suggest to use "with impulses" instead:

set style data impulses
plot "2410.dat" using 1:5  title "read (kBps)" axis x1y1 ls 1 , \
          "" using 1:8  title "write (kBps)" axis x1y1 ls 2 , \
          "" using 1:10  title "% Busy" axis x1y2

[Jason Naughton]

Sorry you can close this ticket... My mistake. Thanks Ethan. I was playing with filters and realized this. I could work with lines if I did the following:

plot "inputdata.txt" using 1:($5 > 0 ? $5 : 0.00001) title "read (kBps)" axis x1y1 ls 1 with lines, \
"inputdata.txt" using 1:($8 > 0 ? $8 : 0.00001) title "write (kBps)" axis x1y1 ls 1 with lines, \
"inputdata.txt' using 1:10 title "% Busy" axis x1y2 with lines

I assume 5.2.2 essentially did this and when >> 5.2.2 came out it no longer respected the idea of a zero on a log plot. I should have known that...