Gnu gif

### "semi"-animated graph with vectors
reset session
set term gif size 1200,1000 animate delay 5 loop 0 optimize
set output "AnimateVectorsSemi.gif"

# create some dummy data
set angle degrees
N = 60
set samples N
set table $Data
    plot [0:360] '+' u (cos($1)):(sin($1)):(sin($1)):(cos($1)) w table
unset table

set xrange[-1:1]
set yrange[-1:1]

do for [i=0:300] {
    plot 'trajectory.dat' u 1:2:3:4:5 every ::0::i with vectors lw 2 lc rgb variable notitle
}
set output
### end of code