I found out that in gnuplot one can obtain multiple curves / datasets from a single file:
splot "file.dat" using 1:2:3, splot "file.dat" using 1:4:5
Also one can embed data in a script like so:
splot "-" using 1:2:3
1 0 1
1 2 3
0.5 3 1.5
However, the following seems not to work:
splot "-" using 1:2:3, "-" using 1:4:5
1 0 1 4 4
1 2 3 3 4
0.5 3 1.5 2.5 -1
is this intentional, does a workaround exist or is it simply not possible?
Gnuplot 5.0.1 datablocks
main.gnuplot
$data << EOD
1 0.5 0.25 2 4
2 1 1 4 8
3 1.5 2.25 6 12
4 2 4 8 16
5 2.5 6.25 10 20
6 3 9 12 24
7 3.5 12.25 14 28
8 4 16 16 32
9 4.5 20.25 18 36
10 5 25 20 40
11 5.5 30.25 22 44
12 6 36 24 48
EOD
splot \
"$data" using 1:2:3 with linespoints title "y = x/2, z = y^2", \
"$data" using 1:4:5 with linespoints title "y = 2x, z = 2*y"
Convert to PNG:
gnuplot -e 'set terminal png' -e 'set output "main.png"' main.gnuplot
Output:
Ubuntu 15.04 has the gnuplot5-x11 package.
On Ubuntu 14.04, you can compile gnuplot from source easily with:
cvs -d:pserver:[email protected]:/cvsroot/gnuplot login
cvs -z3 -d:pserver:[email protected]:/cvsroot/gnuplot co -P gnuplot
cd gnuplot
cvs update -r Release_5_0_1
sudo apt-get build-dep gnuplot
sudo apt-get install lua5.2
./prepare
./configure
time make
sudo make install
gnuplot --version
Yes, the project uses CVS at the time of writing!
Tested on Ubuntu 18.10, gnuplot 5.2.
help datablock inside gnuplot 5.0.1.The following script works with Gnuplot 4.4 as expected. The output attached below
set terminal png
set output 'e.png'
splot "-" using 1:2:3, "" using 1:2:3
1 0 1 4 4
1 2 3 3 4
0.5 3 1.5 2.5 -1
e
1 4 4
1 3 4
0.5 2.5 -1
e
set output
The workaround would be
splot "-" using 1:2:3
1 0 1
1 2 3
0.5 3
splot "-" using 1:2:3
1 4 4
1 3 4
0.5 2.5 -1
If you can put the 5-column data into a plotscript, you can preprocess it to be two 3-column data sets in a plotscript.
I can't get it to work in one line as you have tried. It may not be possible, since
splot 'dat.txt' using 1:2:3, '' using 1:3:4
works, but
splot '-' using 1:2:3, '' using 1:4:5
1 0 1 4 4
1 2 3 3 4
0.5 3 1.5 2.5 -1
does not.
