MATLAB: Inline.inline at 47

Question

Hello people,

Can someone explain what's kind of error is this:

inline.inline at 47 Input must be a string.

P.S. I use diff function in my code.

Thanks.

Answer 1

syms x
fun = sym( get(handles.edit4,'String') );
f = matlabFunction(fun, x);
dfun = diff( fun, x );
df = matlabFunction(dfun, x);