HELP! Koch Square Error: A(I): index out of bounds; value 4 out of bound 3

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Mohanad Arafae 2016-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/312134-help-koch-square-error-a-i-index-out-of-bounds-value-4-out-of-bound-3

回答： KSSV 2016-11-15

addsquare1.m

I don't know why I'm getting this error. Can anyone please tell me the problem and how to fix it?

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Alexandra Harkai 2016-11-14

Duplicate of this, which is a duplicate already.

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KSSV 2016-11-15

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https://ww2.mathworks.cn/matlabcentral/answers/312134-help-koch-square-error-a-i-index-out-of-bounds-value-4-out-of-bound-3#answer_243323

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Check this line in your code:

v=[newpointsx(4);newpointsy(4)]-[newpointsx(2);newpointsy(2)]

you have defined newpointsx(1),newpointsx(2) and newpointsx(3) but you have not defined newpointsx(4) and you are trying to call/ use it in v. Same thing with newpointsy, so the error is popping out. Define newpointsx(4) and newpointsy(4) before/ above v.