Plotting time data with gnuplot

Question

I have a file with several fields:

$ cat report.txt 
2014-04-18T14:21:19 41 33
2014-04-21T02:01:35 42 36
2014-05-14T16:47:58 36 57
2014-05-19T01:01:30 37 58
2014-05-23T01:25:06 41 59
2014-07-23T11:54:48 34 76

I would like to render a graph from it using gnuplot, presented like:

So basically

X-axis: Field 1 (before the T)
Y-Axis: Values from fields 2 and 3
Blue: Value of field 2
Red: Value of field 3

I miss basic understanding of gnuplot on how to do this. I've read the manpage, some online documentation and examples but still can't figure out how to do a simple graph like this.

I edited the title to reflect what your question was, hope you agree. And I didn't check the colors in my answer, but thats not hard to achieve. — kebs
– kebs, Commented Jul 23, 2014 at 14:00

kebs · Accepted Answer · 2014-07-23 13:34:26Z

2

This shall do it (tested with 4.6):

set xdata time
set yrange [0:70]

# input date format
set timefmt "%Y-%m-%dT%H:%M:%S"

# output date format
set format x "%Y\n%m-%d"

plot \
    'report.txt' using 1:2 with lines ti "col 2", \
    'report.txt' using 1:3 with lines ti "col 3"

answered Jul 23, 2014 at 13:34

kebs

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