use of "break"

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Mingze Yin 2022-2-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1659860-use-of-break

评论： Voss 2022-3-1

采纳的回答： Voss

Hi everyone,

I have a few lines of code that look smth like this

exist = false;

for j = 1:1:J

if phi(m,j-1,n)*phi(m,j,n)<=0

x0 = SL+(j-2)*dS;

x1 = SL+(j-1)*dS;

y0 = phi(m,j-1,n);

y1 = phi(m,j,n);

boundary = LinearInterpolate(x0,x1,y0,y1);

exist = true;

end

First of all, im not confident that this is the right implementation. The purpose of these lines of code is to, by going through a for-loop, check the existence of this "boundary", and once such a boundary exists, set the variable "exist = true". I need this boolean variable because i need to use it for an if-statement immediately after (if exist == true ... else...).

My problem is that I do not think the codes above are executing the purpose as stated above? I kinda sense something is off but I can't quite tell which part isn't right... Would be really thankful if someone could point to me some ways to correct these codes. Thank you!

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采纳的回答

Voss 2022-2-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1659860-use-of-break#answer_906035

If you are using the value of boundary immediately after that for loop, then you are using the value of boundary corresponding to the last "boundary" found within the loop.

It's not clear that this is the problem, but, if, for instance, you want the first boundary, you can break immediately after setting exist = true;, which will exit the loop and go to your if exist ... else ... statements.

If that's not the problem, then please describe what the code does vs what you want it to do.

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Mingze Yin 2022-3-1

Oh thank you so much for this, I actually have been oblivous to this function until now. I tried it and it's already helping me discover some overlooked problems in the program. Thanks again!