Indexing inside symbolic product

Question

Aaron J. Hendrickson 2017-7-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/350227-indexing-inside-symbolic-product

评论： Aaron J. Hendrickson 2017-7-25

I am trying to compute a symbolic product with the following code:

syms z theta_1 theta_2 k real
n = 2;
x = sym('x', [n 1])
assumeAlso(theta_2>0)
f = symfun(exp(-(z-theta_1)^2/(2*theta_2))/sqrt(2*pi*theta_2),[z, theta_1, theta_2])
L = symprod(f(x(k),theta_1,theta_2),k,1,n)

However, when I run the code I get the following error:

Error using sym/subsindex (line 766)
Invalid indexing or function definition. When defining a function, ensure that the arguments are symbolic variables and the body of the function is a SYM expression. When indexing, the input must be numeric, logical, or ':'.
Error in sym/subsref (line 805)
            R_tilde = builtin('subsref',L_tilde,Idx);