Gnuplot examples

gnuplot_examples.sh

# Create svg graph file
cat plotdata_raw | gnuplot -e "set terminal svg; plot '-' using 2:1 with lines" > my_graph.svg

# where plotdata_raw is a file with data, 2 columns separated by whitespace.
# using 2:1 means: use column 2 as x, column 1 as y axis
# with lines: draw a line graph


# Parse time
cat plotdata_raw | gnuplot -e "set xdata time; set timefmt '%s'; plot '-' using 2:1 with lines" -p

# With time range defined
# set xrange is not necessary, if left out gnuplot will round up to next whole hour
cat plotdata_raw | gnuplot -e "set xdata time; set timefmt '%s'; set xrange ['1346290193':'1346317667']; plot '-' using 2:1 with lines" -p


# Append gnuplot commands earlier in the pipe
cat plotdata_raw | (echo "plot '-' using 2:1 with lines"; cat) | gnuplot -p

# Smooth curve
cat plotdata_raw | gnuplot -e "set terminal svg; plot '-' using 2:1:(1.0) smooth acsplines with lines" > my_graph.svg