How to animate multiple points (planets) using gnuplot, from a single data file.

问题

I'm trying to make an animation of Jupiter, the sun and an asteroid at the stable Lagrange point L5 as they orbit around their center of mass. I want to do this animation using gnuplot.

I have written a programme which finds their positions at time t/AU. The data I get is below, has columns, time, x position, y position, and has rows, planet, sun, asteroid. I have looked at other solutions to animating in gnuplot but they do not seem to work for me. Please help me understand what I need to type into the gnuplot command line to get an animation of this data please.

Thank you.

0   0   5.19481
0   0   -0.00519481
0   4.50634 2.6


0.01    0.0275397   5.19473
0.01    -2.75397e-05    -0.00519473
0.01    4.52006 2.57607


0.02    0.0550786   5.19451
0.02    -5.50786e-05    -0.00519451
0.02    4.53365 2.55208


0.03    0.082616    5.19415
0.03    -8.2616e-05 -0.00519415
0.03    4.54712 2.52801


0.04    0.110151    5.19364
0.04    -0.000110151    -0.00519364
0.04    4.56046 2.50386


0.05    0.137683    5.19298
0.05    -0.000137683    -0.00519298
0.05    4.57367 2.47965


0.06    0.165211    5.19218
0.06    -0.000165211    -0.00519218
0.06    4.58675 2.45537
etc...

回答1:

This is just a draft:

stats 'test.txt' u 2:3
set xr [STATS_min_x:STATS_max_x]
set yr [STATS_min_y:STATS_max_y]
do for [i=0:STATS_blocks-1] { 
    plot 'test.txt' index i u 2:3 w p pt 7 title sprintf("time: %f",i*0.01)
    pause 1
}

you can directly create an animated gif:

stats 'test.txt' u 2:3
set xr [STATS_min_x:STATS_max_x]
set yr [STATS_min_y:STATS_max_y]
set term gif animate
set output 'test.gif'
do for [i=0:STATS_blocks-1] { 
    plot 'test.txt' index i u 2:3 w p pt 7 title sprintf("time: %f",i*0.01)
}

Now this is quite basic, but can be tuned to make really high quality images.

来源：https://stackoverflow.com/questions/36162214/how-to-animate-multiple-points-planets-using-gnuplot-from-a-single-data-file

标签

animation

gnuplot

physics