My program generates bash scripts that call gnuplot. I don't want to have to make an extra file to store the data; is there any way I can explicitly call all of the values? Or possibly having bash make a temporary file.
Something like
plot {(1,5),(2,10),(3,1)}
is what I am looking for.
You can use the syntax for inline data - filename '-'.
The following example produces a simple plot in a GIF image (bash script):
gnuplot << EOF
set terminal gif
set output 'plot1.gif'
plot '-' using 1:2
1 10
2 20
3 32
4 40
5 50
e
EOF
Gnuplot 5.0.1 datablocks
main.gnuplot
$data << EOD
1 1
2 4
3 9
4 16
EOD
plot "$data" \
with linespoints \
title "my data"
Convert to PNG:
gnuplot -e 'set terminal png' -e 'set output "main.png"' main.gnuplot
Output:
This method is a bit more versatile than '-' as it makes it easier to reuse the same data multiple times, including on the same plot command: How to embed multiple datasets in a gnuplot command script for a single plot command?
Version 5 is available on Ubuntu 15.04, or compile from source with: https://askubuntu.com/a/684136/52975
You may also be interested in the + and ++ special file names when plotting with functions.
Tested on Ubuntu 18.10, gnuplot 5.2.
Example from using shell with pipeline,
gnuplot -p <(echo -e 'plot "-"\n1 1\ne')
Sorry, it's not light (361 characters):
gnuplot -p -e "set xdata time;set timefmt '%s';set xrange [ '$(date +%s)' : '$(date -d 'now +30 seconds' +%s)' ];plot '-' using 1:2 with line title 'ping google';" < <(( ping -c 30 -n google.com| sed -u 's/^64.*time=\([0-9.]\+\) .*$/\1/p;d' | tee >(sed -u 's/.*/now/'| stdbuf -oL date -f - +d%s)) | sed -u 'N;s/\n/ /;s/\([0-9.]\+\) d\([0-9]\+\) */\2 \1/;s/d//')
Running this line will hold your terminal for 30 seconds, than plot on screen a graph presenting ping delay to google.com on last 30 seconds.
The same line could be splitted like this (workable too):
gnuplot -p -e "
set xdata time;
set timefmt '%s';
set xrange [ '$(
date +%s
)' : '$(
date -d 'now +30 seconds' +%s
)' ];
plot '-' using 1:2 with line title 'ping google';
" < <((
ping -c 30 -n google.com |
sed -u 's/^64.*time=\([0-9.]\+\) .*$/\1/p;d' |
tee >(sed -u 's/.*/now/'| stdbuf -oL date -f - +d%s)) |
sed -u 'N;s/\n/ /;s/\([0-9.]\+\) d\([0-9]\+\) */\2 \1/;s/d//'
)
But this don't print values!
So i've added some few bytes:
gnuplot -p -e "set xdata time;set timefmt '%s';set xrange [ '$(date +%s)' : '$(date -d 'now +30 seconds' +%s)' ];plot '-' using 1:2 with line title 'ping google';" < <(( ping -c 30 -n google.com| sed -u 's/^64.*time=\([0-9.]\+\) .*$/\1/p;d' | tee >(sed -u 's/.*/now/'| stdbuf -oL date -f - +d%s) ) | sed -u 'N;s/\n/ /;s/\([0-9.]\+\) d\([0-9]\+\) */\2 \1/;s/d//' | tee >(printf "%(%T)T %s\n" $(</dev/stdin) | column -c $COLUMNS >&2 ))
This may create a window like this:
And simultaneously print on terminal:
17:58:53 19.6 17:59:00 124 17:59:07 159 17:59:13 194 17:59:19 17.1
17:58:54 18.7 17:59:02 19.4 17:59:08 20.3 17:59:14 16.8 17:59:20 20.0
17:58:55 17.9 17:59:03 180 17:59:09 76.4 17:59:15 48.9 17:59:21 192
17:58:57 115 17:59:04 186 17:59:10 226 17:59:16 221 17:59:22 17.1
17:58:58 18.5 17:59:05 16.8 17:59:11 109 17:59:17 19.0
17:58:59 17.0 17:59:06 184 17:59:12 18.8 17:59:18 18.7
Re-written splitted:
gnuplot -p -e "
set xdata time;
set timefmt '%s';
set xrange [ '$(date +%s)' : '$(date -d 'now +30 seconds' +%s)' ];
plot '-' using 1:2 with line title 'ping google';" < <(
(
ping -c 30 -n google.com |
sed -u 's/^64.*time=\([0-9.]\+\) .*$/\1/p;d' |
tee >(sed -u 's/.*/now/'| stdbuf -oL date -f - +d%s)
) | sed -u 'N;s/\n/ /;s/\([0-9.]\+\) d\([0-9]\+\) */\2 \1/;s/d//' |
tee >(printf "%(%T)T %s\n" $(</dev/stdin) |
column -c $COLUMNS >&2 )
)
Solution is using arrays and parametric lines.
X="0.1 0.2 0.3 0.4 0.5"
Y="-1 0 2 4 8"
set parametric
set trange [1:words(X)]; set samples words(X)
plot (0+word(X,int(t))),(0+word(Y,int(t)))
source: https://groups.google.com/d/msg/comp.graphics.apps.gnuplot/UdiiC2cBQNo/xEyj6i7Y910J
You can write something like this directly in gnuplot:
plot "< ./format.sh '{(1,5),(2,10),(3,1)}'"
where format.sh is a pretty simple script in a local file (remember to give it exec permissions):
#!/bin/bash
echo "$1" | sed 's:^..\(.*\)..$:\1:' | sed 's:),(:\n:g' | sed 's:,: :g'
The three sed commands do the following:
{( and })),( to a newline, to spacesSo:
$ ./format.sh '{(1,5),(2,10),(3,1)}'
1 5
2 10
3 1
The gnuplot plot "< command" syntax levers on popen to run command in a shell, capture the output and plot it on the fly. It can be pretty useful also in other circumstances.
