CODEWITHSUNDEEP
plotgraphgnuplot
Kiichiro Matsushita
Kiichiro Matsushita

Reputation: 151

why is my gnuplot result (png from csv) not what I expected?

(gnuplot 5.2.5, Centos 7) I've tried about 8 google examples and my result is still not even close.
Here is my data:

Timestamp,1016.qmgr,1893.sshd,1.systemd,2017.sshd
2018-11-21.04:23:03,0.1,1.0,4.0,2.0
2018-11-21.04:23:04,0.2,2.0,5.0,4.0
2018-11-21.04:23:05,0.3,3.0,6.0,8.0

Here are my plot settings:

 set datafile separator ","
 set title "CPU % Usage per task over time"
 set ylabel '% CPU'
 set xlabel 'Time'
 set grid
 set term png
 set output '10.png'
 set key autotitle columnheader
 plot for [i=2:5] 'Results.10/CPU.csv' using 1:i'

Basically, I was expecting something like this: enter image description here

But I got something like this: enter image description here

Any ideas what to set in the plot parameters file?

Upvotes: 0

Views: 49

Answers (1)

Ethan
Ethan

Reputation: 15143

You need to tell gnuplot that the first column contains time data, and also what the format is:

set xdata time
set timefmt "%Y-%m-%d.%H:%M:%S"

There are other ways to do it, but that is the simplest way to deal with time specified as a string.

[amended answer] If you just want the content of the first column printed along x as an opaque text string, the command is:

plot for [i=2:5] 'Results.10/CPU.csv' using 0:i:xticlabels(1)

Because these strings are very long, you probably will need to rotate the labels so they do not overlap:

set xtics rotate by -45

Upvotes: 1

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