If you are on a Unix system (i.e. not Windows) you can use ‘<cat’ instead of ‘-‘ to read from stdin: plot ‘<cat’ using … Then you can do cat data.txt | gnuplot script.gp. However, in the specific case you mention in your question, with the plot in the for loop, you read the input … Read more
You can plot different columns of the same file like this: plot ‘file’ using 0:1 with lines, ” using 0:2 with lines … (… means continuation). A couple of notes on this notation: using specifies which column to plot i.e. column 0 and 1 in the first using statement, the 0th column is a pseudo … Read more
If you want to increase the resolution try set samples <X> where <X> is an integer. Per default this integer is set to 100. Increase that number to your needs. Though, the higher the integer is chosen the longer it will take gnuplot to plot the graph.
From the Gnuplot documentation: To draw a vertical line from the bottom to the top of the graph at x=3, use: set arrow from 3, graph 0 to 3, graph 1 nohead
It appears that the “every” command in gnuplot is what you’re looking for: plot “filename.txt” every ::1000::2000 using 1:2 with lines Alternatively, pre-process your file to select the rows in which you are interested. For example, using awk: awk “NR>=1000 && NR<=2000″ filename.txt > processed.txt Then use the resulting “processed.txt” in your existing gnuplot command/script.
Gnuplot doesn’t actually expect time data to be in quotes, so you have to tell it: set timefmt ‘”%Y-%m-%d %H:%M:%S”‘ You can put the double quotes inside single quotes as I did here, or escape the quotes: set timefmt “\”%Y-%m-%d %H:%M:%S\”” the same applies to your xrange specification: set xrange [‘”2013-07-21 16:00″‘:'”2013-07-22 16:00″‘] If you … Read more
The source of your problems with the PNG quality is most likely the missing antialiasing in the png terminal of Gnuplot. Since you give no screenshots, I’m not sure what you mean when talking about bad linewidth, but here’s how it looks for me (on MacOS). This screenshot shows the output of gnuplot’s native aquaterm … Read more
If you want to turn it off altogether: gnuplot> set nokey If you want to move the legend, you can do this with gnuplot> set key left top to move it to the top left. If you want to give the lines more meaningful names in the legend, use the title keyword when generating the … Read more
Use the pointtype and pointsize options, e.g. plot “./points.dat” using 1:2 pt 7 ps 10 where pt 7 gives you a filled circle and ps 10 is the size. See: Plotting data.
This should get you started: set datafile separator “,” plot ‘infile’ using 0:1