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How to use ode45 for a row vector

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Erik Sharrer
Erik Sharrer 2020-3-29
评论： Erik Sharrer 2020-3-30
function v = f(t,x);
zeta=0.9
m=5; k=1000;
c=2.*zeta.*sqrt(m*k);
v=[x(2); x(1).*-k/m+x(2).*-c./m];
end
and
clear all
xo=[0.05; 0];
ts=[0 3];
[t,x]=ode45('f',ts,xo);
figure(1)
plot(t,x(:,1))
I was wondering how I can make this plot work with multiple zeta values
zeta=[0, 0.1, 0.25, 0.5, 0.75, 0.9, 1];

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回答（2 个）

madhan ravi
madhan ravi 2020-3-29
Parametrization and loop through zeta.
  3 个评论
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madhan ravi
madhan ravi 2020-3-30
xo=[0.05; 0];
ts=[0 3];
zeta = ... values;
na = sprintfc('zeta=%.2f',zeta); % use compose() in later versions
for zeta = zeta
[t,x]=ode45(@(t,x)myfun(t,x,zeta),ts,xo);
plot(t,x(:,1))
hold on
end
function v = myfun(t,x,zeta)
m=5; k=1000;
c=2.*zeta.*sqrt(m*k);
v=[x(2); x(1).*-k/m+x(2).*-c./m];
end

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Steven Lord
Steven Lord 2020-3-29
See the "Pass Extra Parameters to ODE Function" example on the documentation page for the ode45 function. You can use it as a model for your code.

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