syms variable also a variable of loop

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Dharma Khatiwada 2022-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/1694250-syms-variable-also-a-variable-of-loop

回答： Dharma Khatiwada 2022-4-12

Hi all,

I am using t as syms variable and also as the variable inside loop.I am not sure whether they are connected in the code below. They need to represent the same. Is there a way I can get rid of syms and keep integration part (y2) also inside the loop? Your suggestion will be highly appreciated.

Thanks

Dharma

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a=0.0799;
 b=5.85;
 N=2000;
 dt=0.05;
%
syms x t
c2(x) = (dirac(x-1) + dirac(x-3)+dirac(x-5)+dirac(x-7)+dirac(x-9)+dirac(x-11))*4;
inner2 = c2(x)* exp(-10*(t-x));
y2 = matlabFunction(simplify(int(inner2, x, 0, t)));
%
t=zeros(N,1);
K=zeros(N,1);
t(1)=0;
K(1)=20; 
for i=1:N
    for j=1:N
        t(i+1)=t(i)+dt;
                  K(i+1)=K(i)-a*dt*K(i)-b*dt*t(i)*y2(t(i))*K(i);
    end
end