matlab里求程序运行时间的函数

1. profile
例子：
   profile on
       plot(magic(35))
       profile viewer
       profsave(profile('info'),'profile_results')

       profile on -history
       plot(magic(4));
       p = profile('info');
       for n = 1:size(p.FunctionHistory,2)
           if p.FunctionHistory(1,n)==0
               str = 'entering function: ';
           else
               str = ' exiting function: ';
           end
           disp([str p.FunctionTable(p.FunctionHistory(2,n)).FunctionName]);
       end


2. tic,toc

tic

operation

toc

3. cputime
t=cputime;

your_operation

cputime-t

4. clock,etime
t0 = clock;
operation
etime(clock,t0)