How to animate plots after ode45

I've created code to simulate a 2 mass 3 spring system using ode45. I'd like to animate the plots, but I'm pretty new at matlab and having trouble with some commands. Any help would be greatly appreciated. Thanks. Here's my code:

clc; clear; close all;

x0 = .1; dx0 = 0; x1 = 0; dx1 = 0;

a0 = [x0; dx0; x1; dx1];

[t,a] = ode45(@springthreemasstwo, [0 6*pi], a0);

x = a(:,1); y = a(:,3);

% plot(t,x,t,y) % xlabel('Time'); % ylabel('Displacement');

h1 = animatedline; h2 = animatedline; axis(t,x,t,y);

%set(gca, 'XLim', [0 6*pi], 'YLim', [-.1 .1]);

for i = 1: length(t); addpoints(h1,x(i),y(i)); drawnow hold on addpoints(h2,x(i),y(i)); drawnow hold off end

function [da] = springthreemasstwo(t,a) m = 1; %kg k = 1; %N/m omega = sqrt(k/m);

% Set input values to useful names x0 = a(1); dx0 = a(2); x1 = a(3); dx1 = a(4);

da = [0;0;0;0]; %make da a column vector

% Define spring force

Fx = -k*x0-k*(x0-x1); Fx1 = -k*x1-k*(x1-x0);

da(1) = dx0; da(2) = Fx/m ; da(3) = dx1; da(4) = Fx1/m; end