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function LAB05ex1
m = 1;                                   % mass [kg]
k = 9;                                   % spring constant [N/m]
omega0=sqrt(k/m);            
y0=0.4; v0=0;                            % initial conditions
[t,Y]=ode45(@f,[0,10],[y0,v0],[],omega0);  % solve for 0<t<10
y=Y(:,1); v=Y(:,2);                        % retrieve y, v from Y
figure(1); plot(t,y,'b+-',t,v,'ro-');    % time series for y and v
grid on;
%------------------------------------------------------
function dYdt= f(t,Y,omega0)
y = Y(1); v= Y(2);
dYdt = [v; -omega0^2*y];

 

function LAB05ex1a
m = 1;                         % mass [kg]
k = 9;                         % spring constant [N/m]
c = 1;                         % friction coefficient [Ns/m]
omega0 = sqrt(k/m);  p = c/(2*m);
y0 = 0.4; v0 = 0;              % initial conditions
[t,Y]=ode45(@f,[0,10],[y0,v0],[],omega0,p); % solve for 0<t<10
y=Y(:,1); v=Y(:,2);                         % retrieve y, v from Y
figure(1); plot(t,y,'b+-',t,v,'ro-');       % time series for y and v
grid on
%------------------------------------------------------
function dYdt= f(t,Y,omega0,p)
y = Y(1); v= Y(2);
dYdt = [v; ?? ];                     % fill-in dv/dt

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