deleting rows with a criteria for repeating indices

Question

masih 2017-6-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346772-deleting-rows-with-a-criteria-for-repeating-indices

评论： masih 2017-6-29

采纳的回答： Stephen23

在 MATLAB Online 中打开

Hi All,

I have this matrix:

and I want to do the following to the matrix. Can you please help me how to do it?

1- I want to remove all rows whose second column is 2.

2-For the remainder of the matrix, I want to delete the first two rows whose second column is 1 and 3

So, the output I want should look like this:

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Answer 1

Stephen23 2017-6-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346772-deleting-rows-with-a-criteria-for-repeating-indices#answer_272371

在 MATLAB Online 中打开

>> B = A(A(:,2)~=2,:);
>> X = diff(B(:,2))~=0;
>> X = [true;X] | [true;true;X(1:end-1)];
>> C = B(~X,:)
C =
   407721        1
   407963        1
   409590        1
   544329        3
   553168        3
   552825        3
   408704        1
   407852        1
   409568        1