How do I plot an animated vertical line?

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Charles Austin
Charles Austin 2018-12-4
评论： DERYA DILMEN 2021-2-18
I want to graph the motion of a diver swimming straight downwards to the sea floor at an x position of 20,000 feet from the origin, touching it the sea floor, then immediatelely ascending directly upward.
In my case, the x-axis represents horizontal distance [0, 20000] and the y-axis is depth [0, -1000]. I want use an overlay plot where both the shark's and diver's motion are animated simultaneously. I have approached it from many directions but have not been able to animate the diver's motion.
What command should I use to illustrate the diver while the shark is swimming towards his boat at the surface?
clc, clear
%Here is the motion of the shark, swimming horizontally towards the diver's boat which is 20k feet away.
x1 = [0:1:20000];
y1 = 0*x1+0;
ax=axes;
title('Shark Motion and Diver Motion')
xlabel('Depth (Feet)')
ylabel('Horizontal Position (Feet)')
grid on
set(ax,'xlim',[0 20000],'ylim',[-1000 0]);
hold (ax);
comet(x1,y1);
%Here is the motion of the diver, swimming from the surface of the water
%straight down 1000 feet to the sea floor, then immediately swimming updard at the
%same speed.
x2 = [0:1:20000]
y2 = 0*x1+0;
set(ax,'xlim',[0 20000],'ylim',[0 -1000]);
comet(x2,y2);
%What command should I use to animate the diver's vertical motion as the
%shark approaches? I cannot get 'comet' to work.

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采纳的回答

Cris LaPierre
Cris LaPierre 2018-12-5
You cannot have two 'comets' running at the same time using comet. You could look into using this function from the file exchange.
Additional comments:
  • Your code is throwing an error about the second 'set' command. The order of your YLim needs to be switched.
  • You only need to set the axis limits once, so the second one is actually not necessary

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