Compare two matrix in matlab
显示 更早的评论
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
1 个评论
SALAH ALRABEEI
2021-6-15
what is the matrices size of data1 and data2!
采纳的回答
SALAH ALRABEEI
2021-6-15
Here you can extract those element val that are in both data located at index1 and index2
[val,index1,index2] = intersect(data1,data2)
4 个评论
MCC
2021-6-15
SALAH ALRABEEI
2021-6-15
it will extrac the common values, what else do you want to get!
SALAH ALRABEEI
2021-6-15
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
MCC
2021-6-15
更多回答（1 个）
Sulaymon Eshkabilov
2021-6-15
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);
类别
在 帮助中心 和 File Exchange 中查找有关 Matrix Indexing 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
