Delay function to slow down while loop

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Edward Lau
Edward Lau 2017-11-19
回答： Walter Roberson 2017-11-19
Hey guys. I'm new to MATLAB and I've got a question to ask. I am currently doing up this UI which includes a code which is shown below.
% --- Executes on button press in Start.
function Start_Callback(hObject, eventdata, handles)
% hObject handle to Start (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global s brightness a t;
t = 0.1
a = 1;
readasync(s);
while (a == 1)
brightness = str2double(fscanf(s, '%s', 8));
set(handles.brightness, 'String', num2str(brightness));
disp(brightness);
if brightness < 87
if brightness < 44
fprintf(s, '%s',1);
else
fprintf(s,'%s',2);
end
else
if brightness < 130
fprintf(s, '%s',3);
else
fprintf(s, '%s',4);
end
end
if(a==0)
break;
end
pause(1/10);
end
As you can see, I am currently using a pause function to delay the while loop. However my mentor in college suggested that I use tic toc instead of pause to delay the loop. I do not know how should I go about with it. He has given me this function but I do not know how to implement it. Any advice?
function delay(t)
tic;
while toc < t
end
end

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回答（1 个）

Walter Roberson
Walter Roberson 2017-11-19
pause() is the better choice. It gives a chance for other things to happen, and it gives up control of the CPU so it does not need to run as hot. Using tic/toc requires continuous computation. Please see https://en.wikipedia.org/wiki/Busy_waiting

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