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Asked by Gimpy
on 26 May 2013

Hi, I have the following matrix:

data=[10 1 2 3; 11 4 5 6; 12 7 8 9; 17 4 5 6]

I want to do a query with the following matirx:

built a matrix base on the element value 10 and 17

lookfor=[10;17]

And I'm looking for the following result(values associate with 10 and 17 in this case)

anwser=[10 1 2 3; 17 4 5 6]

I'm looking for a dynamic anwser, data matrix and lookfor matrix will vary and be much more bigger.

thank you in advance for your precious anwsers.

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Answer by Azzi Abdelmalek
on 26 May 2013

Edited by Azzi Abdelmalek
on 26 May 2013

Accepted answer

out=[data(any(data==17,2),:);data(any(data==10,2),:)]

%or

out=data(any(ismember(data,lookfor),2),:)

Show 1 older comment

the cyclist
on 27 May 2013

Looks like he wants to find rows that start with 10, and sum them into one row. Then find rows that start with 11, and sum them.

Answer by the cyclist
on 26 May 2013

Edited by the cyclist
on 26 May 2013

rowIndex = ismember(data(:,1),lookfor); answer = data(rowIndex,:);

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