# Compare two matrix in matlab

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MCC 2021년 6월 15일
댓글: MCC 2021년 6월 15일
I have two matrix data1 and data2. I want to select all rows in data1 that close or equals to data2. I know that loop each element can work but it will take a long time. Is there any easy method I can use?
data1 is attached and data 2 is the following function.
x1 = (0:1:414194)';
data2 = 6*x1;
Thank a lot,
MCC
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SALAH ALRABEEI 2021년 6월 15일
what is the matrices size of data1 and data2!

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### 채택된 답변

SALAH ALRABEEI 2021년 6월 15일
Here you can extract those element val that are in both data located at index1 and index2
[val,index1,index2] = intersect(data1,data2)
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MCC 2021년 6월 15일
Thanks. This works perfet for my problem.

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### 추가 답변(1개)

Sulaymon Eshkabilov 2021년 6월 15일
Easy and fast efficient solution is Logical Indexing, e.g.:
IND = Data1==Data2
D1 = Data1(IND);
D2 = Data2(IND);
You can also employ round() fcn to reduce the small differences in values of the two data sets.
Or even better to compute the min. differences and get those indices, e.g.:
[minVal,ClosestIND] = min(abs(Data1-Data2))
D1 = Data1(ClosestIND);
D2 = Data2(ClosestIND);
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MCC 2021년 6월 15일
Yes. Do you have any ideas of how to write this code? The data1 is 47987 by 1 and the data2 is 414195 by 1.
Thanks a lot,
MCC

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