Matlab一些简单的操作tips

myTimer = timer('Name','MyTimer',               ...
    'Period',2,                 ... % 2秒钟间隔
    'StartDelay',0,                 ...
    'TasksToExecute',inf,           ...
    'ExecutionMode','fixedSpacing', ...
    'TimerFcn',@myTimerCallback,...
    'ErrorFcn',@(~,thisEvent)exit);%  如果报错 则推出程序

start(myTimer);%启动

function myTimerCallback(hObject, eventdata)
     disp(['run time:: ', datestr(datetime('now'),'yyyy-mm-dd HH:MM:SS') ])
end

delete(timerfindall());

baseException = MException('MYFUN:BadParameter','Parameter miss');
throw(baseException);

if strcmp(str,'timestr')%判断字符串相等
        dis('Content is equal');
   end

%{
  ...some thing
%}

function rel = func(arg1,arg2)
    if exist('arg2', 'var') && ~isempty(arg2)%如果传入arg2参数 且不为空
      bla bla
    end
end

function [result] = func(format)
    if ~exist('format', 'var') %不存在默认参数
        result = '默认参数';
    else
        result = format;
    end
end

list(1) = [];%删除指定的下标的元素

del_index_list = [1 2 9 18]
list(del_index_list) = [];%删除多个下标元素

isfield(struct('a','1'),'a1') #判断a1字段是否存在

all(isfield(struct('field1','val1'),{'a','b'}))#判断a,b字段是否都存在

data = struct();
name = 'Dynamic_Name';
data.(name) = 990;

% 回调函数的执行
function rel = func(arg1,callback)
    cb = callback(data);%执行回调函数，传入data数据作为参数
        if ~cb
            bla bla
        end
end

%回调函数作为参数来使用
func(arg1,@(data)deal(1));
func(arg1,@(data)[a=1;deal(a);]);%匿名函数执行多条语句

%普通函数作为回调函数
func(arg1,@cb);
  function rel = cb(data)
    rel = 1
  end

now = 1583237214;
data_diff = 1;
data_uni_diff = 2;
res = [res;now,data_diff,data_uni_diff];

dlmwrite('chech_diff_time.txt',res,'-append');

class(123) % double
ischar('') % logic true