tic toc not working

Currently I am working with a for loop that takes quite some time to run. In order for me to manage my time better I created a simple algortime that predicts when the loop is finished.

tic 
t1 = datetime('now');
for i = 1 : 5000
    k = toc;
    t1 + seconds((k*5000)/i) 
end

The only problem is that it is not working, when i = 5000 the time printed should be equal to the current time but it is always current time minus many minutes. I think this is because when my laptop is in lock screen mode the loop is still running but toc is not. is this true? And if yes is there a way to solve this problem.

Thanks,

Oscar

[Geoff Hayes]

Oscar - can you please clarify this calculation

(k*5000)/i

If k is the elapsed time (in seconds) since the initial call to toc, why do you need to multiply it by 5000 and then divide by the iteration "number"?

[Oscar Schyns]

if i = 2500 and k = 1000 seconds it took a 1000 seconds to complete the first 50 % of the script and therefore will probably take 2000 seconds (5000/2500)*k to complete the script. So add 2000 to the time the script started running

[Alex Mcaulley]

The code works for me as you want. At the end, the time is t1 + k seconds.

[Oscar Schyns]

Was your computer in lock screen / dark screen mode because I think that is the reason why it is not working?

[Alex Mcaulley]

With the computer in lock screen mode I get the same result.