CODEWITHSUNDEEP
matlabfunctionpause
Edward Lau
Edward Lau

Reputation: 1

Delay function to slow down while loop

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

Upvotes: 0

Views: 389

Answers (2)

Sam Roberts
Sam Roberts

Reputation: 24127

Where you have pause(1/10), just write delay(1/10) instead. They are not quite the same thing, as pause has a side effect of flushing any graphics updates and GUI callbacks that may have queued up.

Upvotes: 1

verbatross
verbatross

Reputation: 607

As excaza indicated you can replace the line pause(1/10); by delay(1/10); but the function delay must be visible to where it is being called (so for example you can create a file in the same directory called delay.m that contains the code from your mentor).

It might be helpful to point out that replacing the code pause(1/10); by tic; while toc < 1/10 end; accomplishes the same thing functionally, even though this isn't as good from a coding practice/readability perspective.

Upvotes: 0

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