How to substitute symbolic Jacobian of a multivariate function, D(f)(x)?

Hi, I have the following sample code:

syms x y z fun(omega) dfun
star = x^2 - x*y*z;
fx   = fun(star);

Jacobian = jacobian(fx,[x,y,z]);

lookup_dfun = subs('D(fun)(star)','star',star);

for j=1:size(Jacobian,2)
    tmp = Jacobian(j);
    tmp = subs(tmp,lookup_dfun,dfun);
    Jacobian(j) = tmp;
end

The problem is that when I want to substitute 'D(fun)(star)' into lookup_dfun to replace it later into the symbolic Jacobian (since I will assign the value of this derivative later through 'dfun') I get the following error:

Error using subs
Expected input number 1, S, to be one of these types:

sym
Error in sym/subs (line 60)
validateattributes(F, {'sym'}, {}, 'subs', 'S', 1);

Thanks for your help!

Answer 1

[Jyothis Gireesh]

Please go through the following MATLAB Answer which addresses a similar issue

https://www.mathworks.com/matlabcentral/answers/116008-symbolic-math-substitute-a-derivative-function-with-subs