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How to make any loop in a matlab to be executed 25 times per second

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srinivasa poram
srinivasa poram 2012-7-4
Hi, is there any method by which user can control the execution time of a loop orcode written in matlab script. I want a block code or while loopto be executed 25 times per second.
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Daniel Shub
Daniel Shub 2012-7-4
Do you want approximately 1/25 of a second between the events, or can you have the event happen 25 times in a row as quickly as possible and then wait for a second?

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回答（2 个）

Walter Roberson
Walter Roberson 2012-7-4
Create a timer() object whose callback invokes the code.
You will need to decide what you want done if, for whatever reason, an event would be late: do you want it to start anyhow (possibly making the next event late), or do you want to wait for the next interval.
(For example, if MS Windows decides that it is time to check for new security updates, then the resulting disk and network activity might be enough to delay execution of MATLAB more than 1/25th of a second, so then what?)
Jan
Jan 2012-7-4
A very cheap approach, but perhaps this is enough:
iclock = clock;
while 1
disp(clock);
pause(0.04 - etime(iclock, clock)); % *Not* CPUTIME!
iclock = clock;
end
This does not crash, when the time required for processing the event exceeds 0.04 seconds, but pause(-0.2) is left as soon as possible.
Consider Walter's important arguments. I'd prefer the timer also, but this loop might be enough already.

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