Plot a time series with GNUPLOT

A few things that need to do for making a time series plot with gnuplot:




# set x-axis to display time
set xdata time

# set input format
# Do not use blank to separate them since a blank
# is interpreted as zero, resulting in confusion 
# columns to make a plot 
set timefmt "%H:%M:%S"

# set output format
set format x "%H:%M:%S"

Refer to timefmt for all other format.