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# I don't understand why the elements are not the same on both sides

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Syed Shah on 26 Feb 2021
Answered: Star Strider on 26 Feb 2021
>> N = 200;
h=tFinal/N;
t=linspace(0,tFinal,N+1); % type 'help linspace' to see how this works
z=zeros(1,N+1);
z(1)=1;
for n=1:N
z(n+1) = z(n) + h * ((10*(t(n)+1)^8/((t(n)+1)^10.+9)));
end
for n=1:N
x(n+1) = x(n) + h * ((8*(x(n))/(t(n)+1))-(t+1)*(x(n)^2));
end
plot(t,z,'--')
xlabel('t'); ylabel('y'); title('Look, ma! I solved it even better!');
Unable to perform assignment because the left and right sides have a different number of
elements.
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### Accepted Answer

Star Strider on 26 Feb 2021
The reason is that ‘t’ needs a subscript:
x(n+1) = x(n) + h * ((8*(x(n))/(t(n)+1))-(t+1)*(x(n)^2));
↑ ← HERE
so:
x(n+1) = x(n) + h * ((8*(x(n))/(t(n)+1))-(t(n)+1)*(x(n)^2));
works.
Using ‘t’ without a subscript uses the entire vector. Using ‘t’ with a subacript uses only that one element.
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