How to plot from stdin multiple times in Gnuplot

Question

The data input from stdin fails for the second time as follows, how can I solve this problem?

plot '-' w l
0 0
5 0
e
replot '-' w l
       ^
unexpected or unrecognized token

replot after data input from stdin also fails

plot '-' w l
0 0
5 0
e
replot sin(x)
       ^
unexpected or unrecognized token

The following code works, so I don't know what's the problem.


plot sin(x)
replot '-' w l
0 0
5 0
e

I know plot '-' w l, '-' w l will draw multiple lines. But I'm using gnuplot from the program and I don't have all data to plot in advance. So I can't use this method. I think I can solve this problem by writing the results of the process to a file, but can't I do that from stdin? I want to plot incrementally.

Thanks.

Ethan · Accepted Answer · 2022-01-09 06:19:41Z

2

The recommended way to do this is by using a datablock rather than the pseudo-file '-'. Here is what the input stream to gnuplot should look like.

# Begin input
$DATA1 << EOD
1 2
3 4
EOD

plot $DATA1 with lines

$DATA2 << EOD
5 6 
7 8
EOD

replot $DATA2
# or I would actually prefer
plot $DATA1 with lines, $DATA2 with lines

answered Jan 9, 2022 at 6:19

Ethan

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1 Comment

user48423 Over a year ago

It looks nice. Thank you very much.

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