the bare minimum required to plot that data is to have a program file that looks like this:
set title "SAMPLE"
set terminal canvas
plot [-19:19] 'data.dat'
Setting the terminal
to canvas
means it will output an html canvas
, if you want any different output you need to look into the documentation
then in the terminal you can type:
gnuplot < PROGRAM_FILE > OUTPUT.html
That should get you started, but you really should look into the documentation if you want to do anything more.
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solved Plotting a text file by using gnuplot