joint find statement using ismember & ~ismember

Question

wesso Dadoyan 2016-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/284818-joint-find-statement-using-ismember-ismember

编辑： Stephen23 2016-5-18

Hi,

I wrote the following code: xe=find(ismember(ID,IDA) & ~ismember(DateID,DateIDA)); but it is failing to capture what I want I want to find the observations where the IDs matches (i,e the ids in the ID column exist in the IDA column but the dates respective of the ID column don't exist in the dates respective to IDA column) example: ID=[ 1;2;....20]; IDA=[1;2;....40]; DateID=[729115;729206;.....729298] DateIDA=[729115;733393;.....729298]

what i want xe to find is that for ID=2 & date=729206 I don't have an IDA=2 with a date=729206. I would appreciate any help in this joint find statement

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Answer 1

Stephen23 2016-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/284818-joint-find-statement-using-ismember-ismember#answer_222609

编辑：Stephen23 2016-5-18

在 MATLAB Online 中打开

It works fine for me, using your sample data:

>> ID = [1;2;20];
>> IDA = [1;2;40];
>> DateID = [729115;729206;729298];
>> DateIDA = [729115;733393;729298];
>> ismember(ID,IDA) & ~ismember(DateID,DateIDA)
ans =
     0
     1
     0