Question

我用这种方式定义了一个数学函数

formula = @(a,b) a+b ;

我使用“formula”作为matlab函数的参数：

function  result = myfunction(formula,a,b)

          result = formula(a,b);

end

一切正常

formula = @(a,b) a+b ;
result=myfunction(formula,3,2)

result =

     5

但我的目标是创建一个GUI，所以我尝试了以下内容：

    % --- Executes on button press in pushbutton1.
    function pushbutton1_Callback(hObject, eventdata, handles)
    % hObject    handle to pushbutton1 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)

    formula=get(handles.edit1,'String');
    a=str2double(get(handles.edit2,'String'))
    b=str2double(get(handles.edit3,'String'))

    result = formula(a,b);

    set(handles.text1,'string',result);

但是我收到了这个错误：

Index exceeds matrix dimensions.

Error in untitled>pushbutton1_Callback (line 86)
result = formula(a,b);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in untitled (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)untitled('pushbutton1_Callback',hObject,eventdata,guidata(hObject))


Error while evaluating uicontrol Callback

如何解决我的问题？

Answer 1

get(handles.edit1,'String')的结果不是函数，它是char数组。您应该将其转换为函数：

formula=str2func(['@(a,b)' get(handles.edit1,'String')])

我创建了一个matlab函数，其输入是数学表达式及其参数。如何为我的功能创建GUI？

1 个答案: