Compare two matrix in matlab
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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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Risposta accettata
SALAH ALRABEEI
il 15 Giu 2021
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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SALAH ALRABEEI
il 15 Giu 2021
Another approach, to find values in a that are close or equal to data in b. Eror 0.001
a=1:10;
b=[3.001,4.99,5,6,10];
[x,y] = meshgrid(a,b);
A = [x(:),y(:)];
index = find(abs(A(:,1)-A(:,2))<1e-3);
x(index) % values in a that are close or equal to data in b
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Sulaymon Eshkabilov
il 15 Giu 2021
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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