why am I getting this error?
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%the error
Not enough input arguments.
Error in Exam2>odefun (line 92)
f=[0 ; (2*f0-f0.*heaviside(t,t1)-2*f0.*heaviside(t,t2))];
Error in Exam2 (line 65)
[t,x]=ode45(odefun,tspan,IC);
%my ode45 call
IC=[x0 v0];
tspan=0:dt:tf;
[t,x]=ode45(odefun,tspan,IC);
%my function
function xdot=odefun(t,x)
global f0 wn t1 t2
A=[0 1 ; -wn^2 0];
f=[0 ; (2*f0-f0.*heaviside(t,t1)-2*f0.*heaviside(t,t2))];
xdot=A*x+f;
end
采纳的回答
Steven Lord
2020-11-6
[t,x]=ode45(odefun,tspan,IC);
This attempts to call your odefun function with 0 input arguments and use the function handle it returns as the first input argument to ode45. If you want the first input argument to ode45 to be a function handle to odefun (you want ode45 to use odefun to evaluate the right-hand side of your system of ODEs), you need to add one character.
[t,x]=ode45(@odefun,tspan,IC);
更多回答（1 个）
Cris LaPierre
2020-11-6
0 个投票
Have you created your own heaviside function? The one created by MathWorks only accepts a single input. The one you are using has 2, and apparently expects more.
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