摘要：基于MATLAB的guide制作求解函数极限的GUI计算界面。

1.界面设计

MATLAB提供了可视化的用户界面开发环境(GUDevelopment Environment, GUIDE),实现“所见即所得”。

步骤1：在MATLAB命令窗口输入guide

步骤2：设计并完成GUI的图形控件布局

步骤3 主要按键的回调函数以及相应控件的程序

（1）修改界面左上角的名称的程序要在GUI的打开的回调函数中执行。

function LimitGUI_OpeningFcn(hObject, eventdata, handles, varargin)% This function has no output args, see OutputFcn.% hObject    handle to figure% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% varargin   command line arguments to LimitGUI (see VARARGIN)% Choose default command line output for LimitGUIhandles.output = hObject;movegui(gcf,'center');set(gcf,'NumberTitle','off','Name','函数求极限计算GUI界面');% Update handles structureguidata(hObject, handles);% UIWAIT makes LimitGUI wait for user response (see UIRESUME)% uiwait(handles.figure1);

（2）开始计算函数极限的回调函数，同时输入函数参数，求解结果。

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)x = sym( get(handles.edit2,'string'));%通过sym转成变量类型f = str2sym(get(handles.edit1,'string'));%str2sym函数  将字符类型转化为sym类型x0 = str2num(get(handles.edit4,'string'));I = double(limit(f,x,x0));set(handles.edit3,'string',I);%%利用char将sym类型转成字符类型

2.界面使用说明

基于MATLAB的GUI界面设计了一个计算函数极限的计算界面如下：

计算函数极限:点击运行LimitGUI.m——输入函数和变量和求解的函数值——点击计算即可出现结果。需要GUI的.m程序和fig文件，可以进行赞赏后截图（10元及以上），进行联系，或者在微信公众号云龙派点击“联系掌门”进行联系，或者在公众号内回复截图，几小时内会回复。界面编程不易，还请见谅！

3.界面举例计算

Step1：输入求极限的函数、变量、求极限值 。

Step2：点击计算，可获得相应的结果。

Step3：修改极限值x，点击计算，可获得相应的结果。

Step4：点击清除按键，清除界面输入。

3.GUI主要程序如下

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)x = sym( get(handles.edit2,'string'));%通过sym转成变量类型f = str2sym(get(handles.edit1,'string'));%str2sym函数  将字符类型转化为sym类型x0 = str2num(get(handles.edit4,'string'));I = double(limit(f,x,x0));set(handles.edit3,'string',I);%%利用char将sym类型转成字符类型% --- Executes on button press in pushbutton2.function pushbutton2_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)set(handles.edit1,'string','');set(handles.edit2,'string','');set(handles.edit3,'string','');set(handles.edit4,'string','');% --- Executes on button press in pushbutton3.function pushbutton3_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)closereq;

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作 者 | 郭志龙

编 辑 | 郭志龙

校 对 | 郭志龙