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)