Simulink FFT模块（补充说明）

function varargout = fft_m(varargin) % FFT_M M-file for fft_m.fig % FFT_M, by itself, creates a new FFT_M or raises the existing % singleton*. % % H = FFT_M returns the handle to a new FFT_M or the handle to % the existing singleton*. % % FFT_M('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in FFT_M.M with the given input arguments. % % FFT_M('Property','Value',...) creates a new FFT_M or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before fft_m_OpeningFunction gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to fft_m_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 % Copyright 2002-2003 The MathWorks, Inc. % Edit the above text to modify the response to help fft_m % Last Modified by GUIDE v2.5 10-Sep-2009 10:37:00 % Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @fft_m_OpeningFcn, ... 'gui_OutputFcn', @fft_m_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 fft_m is made visible. function fft_m_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 fft_m (see VARARGIN) % Choose default command line output for fft_m handles.output = hObject; % Update handles structure guidata(hObject, handles); % UIWAIT makes fft_m wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = fft_m_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 button press in pushbutton_draw. function pushbutton_draw_Callback(hObject, eventdata, handles) % hObject handle to pushbutton_draw (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) ScopeData=evalin('base','ScopeData'); axes(handles.axes1); fft_out=fft(ScopeData(:,2)); fs=1/(ScopeData(2,1)-ScopeData(1,1)); plot((0:length(ScopeData(:,2))/2-1)*fs/length(ScopeData(:,2)),10*log(abs(fft_out(1:length(ScopeData(:,2))/2))/abs(max(fft_out)))); xlabel('频率（Hz）'); ylabel('幅度') axis([0 fs/2 -50 0]) % --- Executes on button press in pushbutton_save. function pushbutton_save_Callback(hObject, eventdata, handles) % hObject handle to pushbutton_save (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) close