deleting rows with a criteria for repeating indices

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masih
masih 2017-6-29
评论： masih 2017-6-29
Hi All,
I have this matrix:
460231 1
406962 1
407721 1
407963 1
409590 1
480657 2
527635 2
525820 2
624575 2
593871 2
548098 3
542776 3
544329 3
553168 3
552825 3
473360 1
410370 1
408704 1
407852 1
409568 1
462219 2
510423 2
508923 2
508207 2
507325 2
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:
407721 1
407963 1
409590 1
544329 3
553168 3
552825 3
408704 1
407852 1
409568 1

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采纳的回答

Stephen23
Stephen23 2017-6-29
>> 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

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