MATLAB: Error: “Difference order N must be a positive integer scalar”

errorMATLAB

In fact, I am trying to gather the data in a matrix. But I keep receiving the error "Difference order N must be a positive integer scalar" when I use the "for" loop. Otherwise, it works for every m value. Here's the code I am working on below:
syms y(t) Y t 
%parameters
ed=0.001;
Ev=1000;
n=4000; 
A=zeros(41,10);
ed=0.001;
for m=1:10
   eq = diff(y,t) == (1/m)*(((Ev*(ed*t-y))/n)^m);
   [VF,Subs] = odeToVectorField(eq);
   DE = matlabFunction(VF, 'Vars',{t,Y});
   [t,y] = ode45(DE, [0 10], 0);
   A(:,m)=y;
end

Best Answer

[t,y] = ode45(DE, [0 10], 0);
After the first iteration through your for loop, y is no longer a symbolic function. It was overwritten with a double array by this line. Consider changing the second output of your ode45 call to something like ysol.
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