CODEWITHSUNDEEP
gnuplot
user5517962
user5517962

Reputation:

Changing the x range gnuplot dynamically

How do I change x axis window range in gnuplot for dynamic run time changing data. Presently my range shows a window size from 0 to t, where t keeps increasing. But I want the range to be [t - 2000, t]. I have been looking into how to use xrange, but couldn't get it working.

I also looked at the link, but it didn't help. Dynamically changing the range of a histogram in gnuplot?

Any help would be appreciated.Thanks

Upvotes: 1

Views: 1230

Answers (2)

vagoberto
vagoberto

Reputation: 2442

In linux you can obtain the last 2000 lines of a file with the tail command:

tail -n2000 file.dat           # if data is sorted
sort file.dat | tail -n2000    # if data is not sorted

The output of these commands can be plotted within gnuplot as:

plot "< tail -n2000 file.dat"
plot "< sort file.dat | tail -n2000"

This is equivalent to plot the data in the range [xmax-2000:xmax].

In windows, there exists a Sort command, and there is a Tail command in the Windows Server 2003 Resource Kit Tools. You can also download the unix-commands for windows from the package GNUWin32. The syntax to call these programs are similar to the ones I have described above.

Upvotes: 0

Karl
Karl

Reputation: 2187

You can either plot the datafile twice in your script, after the first (dummy) plot the variable GNUPLOT_DATA_X_MAX contains what it's name says.

Or you use the stats command on your data before plotting, afterwards there is a variable STATS_max_x that you can use to set the desired range for your plot.

Upvotes: 1

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