Unable to convert expression containing symbolic variables into double array error

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I am trying to define a vector xdd in terms of another vector x but when I define elements of the vector xdd in terms of the corresponding elements of x I get the error
Unable to convert expression containing symbolic variables into double array. Apply 'subs' function first
to substitute values for variables.
Can someone please suggest a way to solve this problem?
syms x1 x2 s t
x = [x1; x2];
xdd = [];
for i = 1:length(x0)
xdd(i) = s^2*x(i) + 2*sin(t)
end

Accepted Answer

Star Strider
Star Strider on 9 Mar 2021
Create ‘xdd’ as a cell array instead:
xdd{i} = s^2*x(i) + 2*sin(t)
That works.

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