MATLAB界面编程
Reference to non-exiting field!
控件没有添加Tag属性：
直接双击fig文件启动（会缺少初始化操作）和在m文件执行开始启动结果不一样：
编译fig程序为EXE文件可同时执行多个实例：
选择APP里面的Compiler:
选择自己的工程并build，最后会在对应的文件目录下会生出EXE文件：
设置背景颜色为白，方便截图(另存为emf再粘贴到word比较清晰)
附件：
实现FFT的MATLAB图形界面：
function varargout = easy_fft_1(varargin)
% EASY_FFT_1 MATLAB code for easy_fft_1.fig
% EASY_FFT_1, by itself, creates a new EASY_FFT_1 or raises the existing
% singleton*.
%
% H = EASY_FFT_1 returns the handle to a new EASY_FFT_1 or the handle to
% the existing singleton*.
%
% EASY_FFT_1('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in EASY_FFT_1.M with the given input arguments.
%
% EASY_FFT_1('Property','Value',...) creates a new EASY_FFT_1 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before easy_fft_1_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to easy_fft_1_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 easy_fft_1
% Last Modified by GUIDE v2.5 10-Jul-2018 12:27:54
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @easy_fft_1_OpeningFcn, ...
'gui_OutputFcn', @easy_fft_1_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 easy_fft_1 is made visible.
function easy_fft_1_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 easy_fft_1 (see VARARGIN)
% Choose default command line output for easy_fft_1
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
%init
global ph;
global L;
global Fs;
global NFFT;
global x1;
global x2;
ph=0;
L=1024;
Fs=20000;
NFFT=1024;
x1=0;
x2=0;
global t_mv;
global t_mi;
t_mv =0;
t_mi =0;
% UIWAIT makes easy_fft_1 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = easy_fft_1_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;
% --- Executes on selection change in listbox1.
function listbox1_Callback(hObject, eventdata, handles)
% hObject handle to listbox1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: contents = cellstr(get(hObject,'String')) returns listbox1 contents as cell array
% contents{get(hObject,'Value')} returns selected item from listbox1
% --- Executes during object creation, after setting all properties.
function listbox1_CreateFcn(hObject, eventdata, handles)
% hObject handle to listbox1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: listbox 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 edit1_Callback(hObject, eventdata, handles)
% hObject handle to edit1 (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 edit1 as text
% str2double(get(hObject,'String')) returns contents of edit1 as a double
global Fs;
Fs=str2double(get(hObject,'String'));
fft_paras_dis(handles);
% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject handle to edit1 (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 selection change in popupmenu1.
function popupmenu1_Callback(hObject, eventdata, handles)
% hObject handle to popupmenu1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu1 contents as cell array
% contents{get(hObject,'Value')} returns selected item from popupmenu1
global NFFT;%1024 512 256 128 64 32 16
contents = cellstr(get(hObject,'String'));
t=contents{get(hObject,'Value')};
NFFT=str2double(t);
fft_paras_dis(handles);
% --- Executes during object creation, after setting all properties.
function popupmenu1_CreateFcn(hObject, eventdata, handles)
% hObject handle to popupmenu1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: popupmenu 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 menu1_t_Callback(hObject, eventdata, handles)
% hObject handle to menu1_t (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% --- 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)
fft_plot(handles);
% --------------------------------------------------------------------
function openfile_1_ClickedCallback(hObject, eventdata, handles)
% hObject handle to openfile_1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%----
[filename, pathname] = uigetfile( ...
{'*.txt', 'All TXT-Files (*.txt)'; ...
'*.*','All Files (*.*)'}, ...
'Select Address Book');
global File;
% If "Cancel" is selected then return
if isequal([filename,pathname],[0,0])
return
% Otherwise construct the full file name and _and load the file.
else
File = fullfile(pathname,filename);
end
%open and read data from file
%
%file_name = ['fir_1_input.txt'];
infile = fopen (File, 'r');
% read in data from the file
data = fscanf(infile, '%f');
fclose(infile);
global dd;
global L;
dd = data;%此处是列向量，需要转化为行向量
dd = dd';
L=length(dd);% Length of signal
fft_paras_dis(handles);
% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)
% hObject handle to slider1 (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,'Value') returns position of slider
% get(hObject,'Min') and get(hObject,'Max') to determine range of slider
global ph;
global L;
global Fs;
global NFFT;
ph=(get(hObject,'Value')/ get(hObject,'Max'))*1;
fft_paras_dis(handles);
fft_plot(handles);
% --- Executes during object creation, after setting all properties.
function slider1_CreateFcn(hObject, eventdata, handles)
% hObject handle to slider1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor',[.9 .9 .9]);
end
function fft_plot(handles)
%--------
global Fs; % Sampling frequency
global NFFT; % = 512;
global dd;
global L;
T = 1/Fs; % Sample time
%L=length(dd);% Length of signal
t = (0:L-1)*T*1000; % Time vector/ms
% Sum of a 50 Hz sinusoid and a 120 Hz sinusoid
%x = 0.7*sin(2*pi*50*t) + sin(2*pi*120*t);
%y = x + 2*randn(size(t)); % Sinusoids plus noise
%figure;
%axes(handles.axes1);
%subplot(2,1,1);
cla(handles.axes1);
plot(handles.axes1,t(1:L),dd(1:L),'b');%plot(Fs*t(1:50),y(1:50));
title(handles.axes1,'Signal Corrupted with Noise')
xlabel(handles.axes1,'time (milliseconds)')
%-------------------------------------------------
%NFFT = 2^nextpow2(L); % Next power of 2 from length of y
global ph;
global x1;
global x2;
x1=ceil(ph*L+0.0001);%ceil(0)=0,so we add extral 0.001
if x1+NFFT-1<=L
x2=x1+NFFT-1;
dd_t = dd(x1:x2);
else
x2=L;
dd_t = [dd(x1:x2) zeros(1,NFFT-(x2-x1)-1)];%数据不够则补零
end
%
%
YY=fft(dd_t,NFFT);
Y = YY/(x2-x1+1);
f = Fs/2*linspace(0,1,NFFT/2+1);
A =2*abs(Y(1:NFFT/2+1));
% Plot single-sided amplitude spectrum.
%subplot(2,1,2);
%plot(handles.axes2,f,A) ;
A(1)=0;%delete the DC
cla(handles.axes2);
stem(handles.axes2,f,A,'b');
title(handles.axes2,'Single-Sided Amplitude Spectrum of y(t)')
xlabel(handles.axes2,'Frequency (Hz)')
ylabel(handles.axes2,'|Y(f)|')
%%
disp('-----------------------------------------------');
%YY(10:end)=0;
global t_mv;
global t_mi;
[t_mv ,t_mi]=max(A(1:NFFT/2+1));
pp=t_mi;
YY(pp)=0;YY(NFFT+2-pp)=0;
pp=t_mi-1;
if pp<1
pp=1;
end
YY(pp)=0;YY(NFFT+2-pp)=0;
pp=t_mi+1;
YY(pp)=0;YY(NFFT+2-pp)=0;
%%
disp('YY:');
disp(YY);
idd=ifft(YY,NFFT);
disp('idd:');
disp(idd);
disp('length - idd:');
disp(length(idd));
hold on;
x2_t = x1+length(idd)-1;
if(x2_t)>length(t)
x2_t = length(t);
end
plot(handles.axes1,t(x1:x2_t),abs(idd(1:x2_t-x1+1)),'r');
%
AYY=2*abs(YY(1:NFFT/2+1)/(x2-x1+1));%2*abs(Y(1:NFFT/2+1));
AYY(1)=0;%DC
stem(handles.axes2,f,AYY,'r') ;
disp('-----------------------------------------------');
function fft_paras_dis(handles)
%
global ph;
global L;
global Fs;
global NFFT;
global x1;
global x2;
set(handles.text_paras,'String',['ph:' num2str(ph) ' L:' num2str(L) ' N:' num2str(NFFT) ' Fs:' num2str(Fs) ' x1:' num2str(x1) ' x2:' num2str(x2)]);
global t_mv;
global t_mi;
global File;
set(handles.text_maxs,'String',['mv:' num2str(t_mv) ' mi:' num2str(t_mi) ' ' File]);
%%
% --------------------------------------------------------------------
function uipushtool5_ClickedCallback(hObject, eventdata, handles)
% hObject handle to uipushtool5 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
gen_txt_fft;
disp('gen txt ok!');
来源：CSDN
作者：时光-易逝
链接：https://blog.csdn.net/u011329967/article/details/104089753