ode45 events using problem

[T,Z] = ode45(@bouncing, [0 12], [100 0],'tspan','options','events');
options = odeset('events');
events(t,z) = [y(1)-10,1,-1]
value = y(1)-10;
isterminal = 1;
direction = -1;
axis([-5 5 0 120])
a = 0;
y = Z(:,1);
while a < 69
  viscircles([0,y(1+a)],10,'Linewidth',10');
  pause(0.1);
  cla;
  a = a+1;
end

Answer 1

[Walter Roberson]

events = @(t,y) [y(1)-10, 1, -1];
options = odeset('events', events);
[T,Z] = ode45(@bouncing, [0 12], [100 0], options);
axis([-5 5 0 120])
y = Z(:,1);
for a = 1 : 69
  viscircles([0,y(a)],10,'Linewidth',10');
  pause(0.1);
  cla;
end

However, I do not see any reason to assume you will get at least 69 results. It would make more sense to use length(y) instead of 69.

[daniel parker]

because i have 69 columns i used it. thank you for your comment but when i try to perform your the code i get this error

Error in deneme (line 3)
[T,Z] = ode45(@bouncing, [0 12], [100 0], options);

did i called the function wrongly ? this is my bouncing function code

function dz = bouncing(t,z) %situation 0
dz = zeros(2,1);
g=10;
dz(1) = z(2);
dz(2) = -g;

second error is that

Error using feval
Output argument "varargout{2}" (and maybe others) not assigned during call to "@(t,y)[y(1)-10,1,-1]"

[Walter Roberson]

function deneme
  options = odeset('events', @bb_events);
  [T,Z] = ode45(@bouncing, [0 12], [100 0], options);
  axis([-5 5 0 120])
  y = Z(:,1);
  for a = 1 : length(y)
    viscircles([0,y(a)],10,'Linewidth',10');
    pause(0.1);
  end
end

function dz = bouncing(t,z) %situation 0
  dz = zeros(2,1);
  g=10;
  dz(1) = z(2);
  dz(2) = -g;
end

function [value, isterminal, direction] = bb_events(t, y)
  value = y(1)-10;
  isterminal = 1;
  direction = -1;
end

[daniel parker]

thank you :)