Getting an error while using ODE45 with an anonymous function created from a griddedInterpolant

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Nicolás Duque Suarez 2019-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/481971-getting-an-error-while-using-ode45-with-an-anonymous-function-created-from-a-griddedinterpolant

评论： Nicolás Duque Suarez 2019-9-26

Hello,

I'm trying to integrate an array using ode45 representing acceleration. Because the array is not a function, i used griddedInterpolant in order to interpolate the values of the function. The problem is that when i try to use ODE 45 with the recently created anonymous function i get the following error:

Is there a way to fix this error? or is threre any other way of realizing this numeric integral? I already tried using euler method (ODE1) but the answer doesn't converge, and other functions such as cumtrapz doesn't work either.

Thanks in advance for any help.

t=1:223
F=griddedInterpolant(t,qdd(:,1));
fun=@(i) F(i)
t0=0
tfinal=223
y0=qd(1,1)
y=ode45(fun,[t0 tfinal],y0)
Error using @(i)F(i)
Too many input arguments.
Error in odearguments (line 90)
f0 = feval(ode,t0,y0,args{:});   % ODE15I sets args{1} to
yp0.
Error in ode45 (line 115)
  odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0,
  options, varargin);