In a GUI, How do I accept user input and turn string into a function? ex. 3*x^2 +2*x -5

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Ernesto Juarez
Ernesto Juarez 2016-12-4
回答： Walter Roberson 2016-12-4
% --- Executes on button press in Graph.
function Graph_Callback(hObject, eventdata, handles)
syms x y;
userInput = get(handles.user1,'String');
fun = @(x) userInput;
x=0:10;
y = fun(x);
axes(handles.axes1);
plot(x,y);
xlabel('x'); ylabel('y');
guidata(hObject,handles);

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采纳的回答

Walter Roberson
Walter Roberson 2016-12-4
fun = str2func( ['@(x)' userInput])

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