如何在图形用户界面中绘制Matlab中的多个点？

我需要在Matlab中创建一个GUI来绘制点（用户可以根据需要绘制任意多个点），然后允许用户使用最小二乘法绘制一条线

我有两个主要问题

我的代码没有在工作区中创建变量，因此我无法对数据执行任何操作

目前，我的程序只更新了我给出的一点

这是我目前的代码：

function varargout = florin(varargin)
% FLORIN MATLAB code for florin.fig
%      FLORIN, by itself, creates a new FLORIN or raises the existing
%      singleton*.
%
%      H = FLORIN returns the handle to a new FLORIN or the handle to
%      the existing singleton*.
%
%      FLORIN('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in FLORIN.M with the given input arguments.
%
%      FLORIN('Property','Value',...) creates a new FLORIN or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before florin_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to florin_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help florin

% Last Modified by GUIDE v2.5 16-May-2017 02:02:26

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @florin_OpeningFcn, ...
                   'gui_OutputFcn',  @florin_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before florin is made visible.
function florin_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 florin (see VARARGIN)

% Choose default command line output for florin
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes florin wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = florin_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;



function x_Callback(hObject, eventdata, handles)
% hObject    handle to x (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of x as text
%        str2double(get(hObject,'String')) returns contents of x as a double
valx=str2num(get(handles.x,'String'));
setappdata(0,'x',valx);

% --- Executes during object creation, after setting all properties.
function x_CreateFcn(hObject, eventdata, handles)
% hObject    handle to x (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function y_Callback(hObject, eventdata, handles)
% hObject    handle to y (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of y as text
%        str2double(get(hObject,'String')) returns contents of y as a double
valy=str2num(get(handles.y,'String'));
setappdata(0,'y',valy);
% --- Executes during object creation, after setting all properties.
function y_CreateFcn(hObject, eventdata, handles)
% hObject    handle to y (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- 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)
m=getappdata(0,'x');
n=getappdata(0,'y');
plot(m,n,'r.','MarkerSize',20);

% --- 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)

---

问候弗洛林。基于这个问题，我可以理解您希望创建一个GUI，这样用户可以输入一组点，然后绘制它们，还可以使用最小二乘法找到并绘制最佳拟合线。在你的进程中，你会遇到两个问题

对于第一个问题。如果希望通过m文件向工作区发送/创建变量，并从工作区获取变量，可以使用

assignin

和

evalin

功能

assignin('base','x',100);
y=1+evalin('base','x');

上面的短代码通过m文件在工作区中创建变量

x

，然后将其作为变量

y

，该变量将变为

y=101

。你可以在这里和这里阅读更多

对不起，我不明白你的第二个问题

---

你可以先试试这个。谢谢。

我强烈反对使用这两个函数中的任何一个，因为它们都会产生意外行为。关于@Suever什么样的意外行为？如果用户在基本工作区中已经有一个名为

x

的变量，会发生什么情况？此外，应不惜一切代价避免评估及其亲属。从GUI获取数据有很多更优雅的方法。特别是对于指南，您可以创建一个函数以将数据作为输出返回。它将更新现有变量

x

。我不太明白你的最后一行，你的意思是不通过在工作区中创建变量？第一个问题是关于在工作区中创建变量，然后使用它的具体问题。