Question

I’m having some problems trying to plot two different data sets from stdin in gnuplot… This is the command I’m testing with:

% gnuplot -persist <<EOF            
plot '-' index 0 with points, \
'' index 1 with points
1 1.2
2 1.8
3 1.6


1.1 0.8
2.1 0.3
3.1 1.0
EOF

Any advise will be very helpful.
Thanks

Answer 1

I think this should help you

It’s even possible to read data from standard input multiple times within the same
plot command:

plot '-', '-' 

will read data until an end-of-file character is encoun
tered and then expect to read more data (for the second “file”) until finding a second
EOF character. Of course, the data entered at a prompt this way can have multiple col
umns, from which we can select some with using, and all the other features of the
plot command can be used as well.

(from: Philipp K. Janert, Gnuplot In Action)