Subtract 1 from variable each second

Imagine I got something like this:

counter = 100;
while true
    do_something=true;
    pause(rand);
    disp(counter);
end

Then I need the counter variable to get subtracted by 1 each second inside the while loop. Any suggestions?

Answer 1

[Jan]

counter = 100;
TimerH = timer('TimerFcn', @doCount, 'ExecutionMode', 'fixedRate', ...
    'Period',   1.0, 'UserData', counter);
start(TimerH);

while true
    do_something=true;
    pause(rand);
    counter = TimerH.UserData;
    disp(counter);
end

delete(TimerH);


function doCount(TimerH, EventData)
TimerH.UserData = TimerH.UserData - 1;
end

Do you really need an active counter?

iniTime = clock;
while true
    do_something=true;
    pause(rand);
    counter = 100 - etime(clock, iniTime);
    disp(counter);
end

[Mathieu NOE]

Whow

I'm impressed !

so much science for a counter !

[Martin]

me2, thanks!

[Jan]

@Mathieu NOE: And it even counts backwards from 100 for 3 weeks. :-)

Answer 2

[Mathieu NOE]

hi

nothing fancy

counter = 100;
while true
    do_something=true;
    counter = counter -1; % decrement counter
    pause(1); % 1 second pause
    disp(counter);
end

[Martin]

yeah I know this one, but the hing is pause has to be pause(rand); (this loop can take between something like 0.001sec and 3 weeks)...

[Mathieu NOE]

so how do you plan to get the counter decremented every second ??

[Martin]

yeah thats my question :) I guess I need to use

now

(before the loop) and also indside the loop, but I have hard times figure it out which is why I am asking