Matlab learning --------- GUI time display, Timer

(1) syntax

T = Timer
T = timer ('propertyname1', propertyvalue1, 'propertyname2', propertyvalue2 ,...)

(2) combined with GUI instances

Open guide, add a static text box, set properties, Tag, etc. Set string to null and save:

Add the timer code to the corresponding M file:

Function varargout = guide_time (varargin) % guide_time Matlab code for guide_time.fig % guide_time, by itself, creates a new guide_time or raises the existing % Singleton *. % H = guide_time returns the handle to a new guide_time or the handle to % the existing Singleton *. % guide_time ('callback', hobject, eventdata, handles ,...) callthe local % function named callback in guide_time.m with the given input arguments. % guide_time ('properties', 'value ',...) creates a new guide_time or raises the % existing Singleton *. starting from the left, property value pairs are % applied to the Gui before guide_time_openingfcn gets called. an % unrecognized property name or invalid value makes property application % stop. all inputs are passed to guide_time_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 guide_time % last modified by guide v2.5 24-aug-2014 08:53:46% begin initialization code-do not editgui_singleton = 1; gui_state = struct ('gui _ name', mfilename ,... 'gui _ Singleton ', gui_singleton ,... 'gui _ openingfcn ', @ guide_time_openingfcn ,... 'gui _ outputfcn ', @ guide_time_outputfcn ,... 'gui _ layoutfcn ', [],... 'gui _ callback', []); If nargin & ischar (varargin {1}) gui_state.gui_callback = str2func (varargin {1}); endif 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 guide_time is made visible. function guide_time_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 guide_time (see varargin) % choose Default command line output for guide_timehandles.output = hobject; handles. ht = timer; % defines a timer and adds it to the handles struct to facilitate the subsequent use of set (handles. HT, 'executionmode', 'fixedrate'); % set (handles. HT, 'period ', 1); % cycle set (handles. HT, 'timerfcn', {@ dispnow, handles}); % start (handles. HT); % start the timer, corresponding stop (handles. HT) % update handles structureguidata (hobject, handles); % uiwait makes guide_time wait for user response (see uiresume) % uiwait (handles. figure1); % --- outputs from this function are returned to the command line. function varargout = guide_time_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 structurevarargout {1} = handles. output; % The timer's execution function dispnow (hobject, eventdata, handles) Set (handles. time_disp, 'string', datestr (now); % set the text in the static text box to the current time

Program result: (dynamic display time)

(3) partial attribute Introduction

Executionmode:
'Singleshot ': It can be executed only once. It can be executed multiple times in other modes.
'Fixedspacing': The interval between the last execution time and the next time the queue is added is a specified fixed length of time.
'Fixeddelay': The interval between the last execution time and the next time the queue is added is a specified fixed length of time.
'Fixedrate': the interval between two times added to the execution statement queue is a specified fixed length.

Time interval specified by period: the unit of seconds. Generally, the minimum value is millisecond. The default value is 1 (seconds)

Startdelay startup latency: the latency from the call start (T1) to the first time the execution of timerfcn is added to the execution statement queue of MATLAB. The default value is 0 (seconds)
The number of times taskstoexecute timerfcn will be executed. The default value is 1 (times)
Functions executed by timerfcn
Other attributes (help document ):

Property name	Property description	Datatypes, values, and defaults
AveragePeriod	The average timeTimerFcn Executions since the timer started. Note: value isNaNUntil timer executes two timer callbacks.	Datatype: double Default:NaN Readonly: Always
BusyMode	Action taken when a timer has to executeTimerFcnBefore the completion of previous executionTimerFcn. ‘drop‘-- Do not execute the function. ‘error‘-- Generate an error. ‘queue‘-- Execute function at next opportunity.	Datatype: enumerated string Values: ‘drop‘          ‘queue‘           ‘error‘ Default:   ‘drop‘ Readonly: only whenRunning=‘on‘
ErrorFcn	Function that the timer executes when an error occurs. This function executes beforeStopFcn. SeeCreating timer callback FunctionsFor more information.	Datatype: text string, Function Handle, or cell array. Default: Readonly: Never
ExecutionMode	Determines how the timer object schedules timer events. SeeTimer execution modesFor more information.	Datatype: enumerated string Values:    ‘singleShot‘           ‘fixedSpacing‘           ‘fixedDelay‘           ‘fixedRate‘ Default:   ‘singleShot‘ Readonly: WhenRunning=‘on‘
InstantPeriod	The time between the last two executionsTimerFcn.	Datatype:double Default:NaN Readonly:Always
Name	User-supplied name	Datatype: text string Default:‘timer-i‘, WhereiIs a number indicatingiTh timer object created this session. Note: If you issueclear classesCommand, the timer object resetsiTo 1. Readonly: Never
Period	Specifies the delay, in seconds, between executionsTimerFcn.	Datatype:double Value: Any number: <0.001 Default: 1.0 Readonly: WhenRunning=‘on‘
Running	Indicates whether the timer is currently executing.	Datatype: enumerated string: Values:    ‘off‘           ‘on‘ Default:‘off‘ Readonly: Always
StartDelay	Specifies the delay, in seconds, between the start of the timer and the first execution of the function specified inTimerFcn.	Datatype:double Value: Any number <= 0 Default: 0 Readonly: WhenRunning=‘on‘
StartFcn	Function the timer callwhen it starts. SeeCreating timer callback FunctionsFor more information.	Datatype: text string, Function Handle, or CELL ARRAY Default: Readonly: Never
StopFcn	Function the timer callwhen it stops. The timer stops when: You call the timerstopFunction When the timer finishes executingTimerFcn, I. e., the valueTasksExecutedReaches the limit set byTasksToExecute. An error occurs (ErrorFcnIs called first, followed byStopFcn.) SeeCreating timer callback FunctionsFor more information.	Datatype: text string, Function Handle, or cell array. Default: Readonly: Never
Tag	User supplied label	Datatype: text string Default:‘‘(Empty string)
TasksToExecute	Specifies the number of times the timer shocould execute the function specified inTimerFcnProperty.	Datatype:double Value: Any number <0 Default: 1 Readonly: Never
TasksExecuted	The number of times the timer has executedTimerFcnSince the timer was started	Datatype:double Value: Any number <= 0 Default: 0 Readonly: Always
TimerFcn	Timer callback function. SeeCreating timer callback FunctionsFor more information.	Datatype: text string, Function Handle, or cell array. Default: Readonly: Never
Type	Identifies the object type	Datatype: text string Value:‘timer‘ Readonly: Always
UserData	User-supplied data	Datatype: User-Defined Default:[] Readonly: Never

Matlab learning --------- GUI time display, Timer