matlab GUI回调(matlab GUI callback)
我在m文件中有这个功能，我想对按钮进行回调，但我不知道如何。 谁能帮我？ 这是功能：
function f=fftreal(f,N,dim); error(nargchk(1,3,nargin)); if nargin<3 dim=[]; end; if nargin<2 N=[]; end; if ~isreal(f) error('Input signal must be real.'); end; [f,N,Ls,W,dim,permutedsize,order]=assert_sigreshape_pre(f,N,dim,'FFTREAL'); N2=floor(N/2)+1; f=comp_fftreal(f); permutedsize(1)=N2; f=assert_sigreshape_post(f,dim,permutedsize,order); end这是GUI自动生成的用户界面代码：
function varargout = Fourier_Transform_GUI(varargin) %FOURIER_TRANSFORM_GUI M-file for Fourier_Transform_GUI.fig % FOURIER_TRANSFORM_GUI, by itself, creates a new FOURIER_TRANSFORM_GUI or raises the existing % singleton*. % % H = FOURIER_TRANSFORM_GUI returns the handle to a new FOURIER_TRANSFORM_GUI or the handle to % the existing singleton*. % % FOURIER_TRANSFORM_GUI('Property','Value',...) creates a new FOURIER_TRANSFORM_GUI using the % given property value pairs. Unrecognized properties are passed via % varargin to Fourier_Transform_GUI_OpeningFcn. This calling syntax produces a % warning when there is an existing singleton*. % % FOURIER_TRANSFORM_GUI('CALLBACK') and FOURIER_TRANSFORM_GUI('CALLBACK',hObject,...) call the % local function named CALLBACK in FOURIER_TRANSFORM_GUI.M with the given input % arguments. % % *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 Fourier_Transform_GUI % Last Modified by GUIDE v2.5 05-Dec-2012 15:46:34 % Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @Fourier_Transform_GUI_OpeningFcn, ... 'gui_OutputFcn', @Fourier_Transform_GUI_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 Fourier_Transform_GUI is made visible. function Fourier_Transform_GUI_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 unrecognized PropertyName/PropertyValue pairs from the % command line (see VARARGIN) % Choose default command line output for Fourier_Transform_GUI handles.output = hObject; % Update handles structure guidata(hObject, handles); % UIWAIT makes Fourier_Transform_GUI wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = Fourier_Transform_GUI_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 exit. function exit_Callback(hObject, eventdata, handles) % hObject handle to exit (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 FFT. function FFT_Callback(hObject, eventdata, handles) % hObject handle to FFT (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 iFFT. function iFFT_Callback(hObject, eventdata, handles) % hObject handle to iFFT (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 DFT. function DFT_Callback(hObject, eventdata, handles) % hObject handle to DFT (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 iDFT. function iDFT_Callback(hObject, eventdata, handles) % hObject handle to iDFT (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 load_file. function load_file_Callback(hObject, eventdata, handles) % hObject handle to load_file (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)I have this function in an m-file and I want to make a callback for push button but I have no clue how. Can anyone help me? This is the function:
function f=fftreal(f,N,dim); error(nargchk(1,3,nargin)); if nargin<3 dim=[]; end; if nargin<2 N=[]; end; if ~isreal(f) error('Input signal must be real.'); end; [f,N,Ls,W,dim,permutedsize,order]=assert_sigreshape_pre(f,N,dim,'FFTREAL'); N2=floor(N/2)+1; f=comp_fftreal(f); permutedsize(1)=N2; f=assert_sigreshape_post(f,dim,permutedsize,order); endThis is the user interface code that the GUI automatically generated:
function varargout = Fourier_Transform_GUI(varargin) %FOURIER_TRANSFORM_GUI M-file for Fourier_Transform_GUI.fig % FOURIER_TRANSFORM_GUI, by itself, creates a new FOURIER_TRANSFORM_GUI or raises the existing % singleton*. % % H = FOURIER_TRANSFORM_GUI returns the handle to a new FOURIER_TRANSFORM_GUI or the handle to % the existing singleton*. % % FOURIER_TRANSFORM_GUI('Property','Value',...) creates a new FOURIER_TRANSFORM_GUI using the % given property value pairs. Unrecognized properties are passed via % varargin to Fourier_Transform_GUI_OpeningFcn. This calling syntax produces a % warning when there is an existing singleton*. % % FOURIER_TRANSFORM_GUI('CALLBACK') and FOURIER_TRANSFORM_GUI('CALLBACK',hObject,...) call the % local function named CALLBACK in FOURIER_TRANSFORM_GUI.M with the given input % arguments. % % *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 Fourier_Transform_GUI % Last Modified by GUIDE v2.5 05-Dec-2012 15:46:34 % Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @Fourier_Transform_GUI_OpeningFcn, ... 'gui_OutputFcn', @Fourier_Transform_GUI_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 Fourier_Transform_GUI is made visible. function Fourier_Transform_GUI_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 unrecognized PropertyName/PropertyValue pairs from the % command line (see VARARGIN) % Choose default command line output for Fourier_Transform_GUI handles.output = hObject; % Update handles structure guidata(hObject, handles); % UIWAIT makes Fourier_Transform_GUI wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = Fourier_Transform_GUI_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 exit. function exit_Callback(hObject, eventdata, handles) % hObject handle to exit (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 FFT. function FFT_Callback(hObject, eventdata, handles) % hObject handle to FFT (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 iFFT. function iFFT_Callback(hObject, eventdata, handles) % hObject handle to iFFT (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 DFT. function DFT_Callback(hObject, eventdata, handles) % hObject handle to DFT (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 iDFT. function iDFT_Callback(hObject, eventdata, handles) % hObject handle to iDFT (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 load_file. function load_file_Callback(hObject, eventdata, handles) % hObject handle to load_file (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)
原文：https://stackoverflow.com/questions/13725098
更新时间：2024-01-27 06:01
最满意答案
value = value + 1不是do块中的有效语句。 唯一有效的陈述是：
变量绑定：
let pattern = expressionmonadic binding：
pattern <- expression一个表达式，用于评估monadic动作
但是，您不需要
do块，因为您不需要monadic副作用来实现此功能。 此外，return不像命令式语言中的return- 它不是从当前函数返回的关键字，而是创建返回值的操作的函数。 看起来你的value = value + 1意图是改变value，但Haskell中没有可变变量。 （有一些可变的引用类型，例如IORef，但你在这里不需要它们。）因此，一种解决方案是简单地使用表达式：
divideBy :: (Ord a, Num a) => a -> a -> a divideBy _ 0 = 0 divideBy num den | num - den >= 0 = 1 + divideBy (num - den) den | otherwise = 0这正是它的意思：如果
den为0，则num和den的商为0; 如果num - den >= 0，则它比num - den和den的商多1; 否则它是0。
value = value + 1isn’t a valid statement in adoblock. The only valid statements are:
A variable binding:
let pattern = expressionA monadic binding:
pattern <- expressionAn expression that evaluates to a monadic action
However, you don’t need a
doblock because you don’t need monadic side effects to implement this function. Furthermore,returnisn’t likereturnin an imperative language—it’s not a keyword that returns from the current function, but a function that creates an action that returns a value. It looks like your intent withvalue = value + 1was to mutatevalue, but there are no mutable variables in Haskell. (There are mutable reference types such asIORef, but you don’t need them here.)So one solution is to simply use an expression:
divideBy :: (Ord a, Num a) => a -> a -> a divideBy _ 0 = 0 divideBy num den | num - den >= 0 = 1 + divideBy (num - den) den | otherwise = 0This says exactly what it means: the quotient of
numanddenis0ifdenis0; ifnum - den >= 0, then it’s 1 more than the quotient ofnum - denandden; otherwise it’s0.
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