gnuplot experiences

# Gnuplot script file for plotting data in file "exercise.dat"
# This file is called   exer.p
set   autoscale                        # scale axes automatically
unset log                              # remove any log-scaling
unset label                            # remove any previous labels
set xtic auto                          # set xtics automatically
set ytic auto                          # set ytics automatically
set style data fsteps
set title "Exercise progress"
set xlabel "Date\nTime"
set timefmt "%m/%d/%y\t%H%M"
set yrange [ 0 : ]
set ylabel "Pushups"
set term postscript
set output "exercise.ps"
set yrange [ 0 : ]
set xdata time
set format x "%m/%d\n%H:%M"
set grid
set key left
set style line 1 lt -1 lc rgb "#334488" lw 2 ps 2 pt 4
set style line 2 lt -1 lc rgb "#338833" lw 3
set style line 3 lt -1 lc rgb "#883333" lw 2 ps 2 pt 6
plot    "exercise.dat" using 1:4 t 'Exercise Pushups' with linespoints ls 1 , \
        "exercise.dat" using 1:4 t '', \
        "exercisep.dat" using 1:4 t 'Exercise Pullups' with linespoints ls 2, \
        "exercises.dat" using 1:4 t 'Exercise Situps' with linespoints ls 3
save "exercise.plt"
quit

I am using exercise to motivate me to do a new plot type for each addition. I am learning how to use the functions of gnuplot and convert. The next step is to scale the different categories. Since running and biking will have a different scale I need to determine how to show travel versus time for running and biking.

gnuplot exer.p
convert -rotate "+90" exercise.ps exercise.png
display exercise.png

I use a script ex.sh above to load and run gnuplot and then convert and rotate the output as the ps postscript is landscape and not portrait, which I don't know why that is, but probably has to do with width height interpretation.