Need to put a limit on a loop

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brian grove 2015-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/217767-need-to-put-a-limit-on-a-loop

回答： Walter Roberson 2015-5-20

I have an elseif statement that detects when a ball enters into a circle. The problem is that once the ball enters the circle it does not leave fast enough sometimes and keeps running the else if statement. I need the loop to only execute once and then wait a certain amount of time before it can be used again.

elseif distsq1 <= Circle1Radius.^2 
       plot(circleXs,circleYs,'b');
       bounce([(ballVector(1)), (Y_FACTOR + -1*(ballVector(2)))]);

Thoughts?

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Answer 1

Walter Roberson 2015-5-20

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Set a variable to be true when you detect you are inside the circle and false when you detect you are outside. Then in the else condition, you still need to test whether you are still inside the circle, but if you find you are and the flag is already set, don't do anything.

You can adjust this to be a counter instead of true/false, if you want to ignore it for a certain number of times. You can adjust it to be a flag and also a record of the time you bounce()'d it, if you want to check by time.