Question regarding a find function(search for data)

2013 5 26
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1 个投票

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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Azzi Abdelmalek
Azzi Abdelmalek 2013-5-26
编辑：Azzi Abdelmalek 2013-5-26

0 个投票

out=[data(any(data==17,2),:);data(any(data==10,2),:)]
%or
out=data(any(ismember(data,lookfor),2),:)

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Gimpy
Gimpy 2013-5-26
is there a way to do a "group by" with this method?
let'S say the data is the following: data=[10 1 2 3; 11 4 5 6;10 0 20 30; 11 4 5 6; 12 7 8 9; 17 40 50 60]
lookfor=[10;17]
And I want the following anwser:
anwser=[10 1 22 33; 11 8 10 12]
thank you
Gimpy
Gimpy 2013-5-26
using: out=data(any(ismember(data,lookfor),2),:)
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-26
How did you find anwser=[10 1 22 33; 11 8 10 12]
the cyclist
the cyclist 2013-5-27
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.

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更多回答（1 个）

the cyclist
the cyclist 2013-5-26
编辑：the cyclist 2013-5-26

0 个投票

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

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