How to output result to static text uicontrol?

Hello. I wanna to develop GUI application for finding derivative of function.

function B_Callback(hObject, eventdata, handles)
syms x;
f=cos(x);
set(handles.Static_text1, 'String', diff(f));

But it works wrong.

Answer 1

[Akiva Gordon]

This is likely not working because diff(f) is of type SYM, and the SET function is expecting a string of type CHAR. In order to do this, you can try changing the type by using this instead:

set(handles.Static_text1, 'String', char(diff(f)) );