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Indexing between two lists

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bene1
bene1 2020-12-6
评论： bene1 2020-12-6
Hello. I am fairly new to Matlab and looking for some help with the logic of indexing between two lists.
Matrix A has known distances between points.
A =
% From To DistHzPub
1 2 100
1 3 400
1 4 1000
2 3 300
2 4 900
3 4 600
Matrix B has multiple measurements between the same points.
B =
% From To DistHorz
1 2 100.01
1 2 100.04
1 3 400.02
1 3 400.05
1 4 1000.03
1 4 1000.01
2 3 300.00
2 3 300.04
2 4 900.06
2 4 900.02
3 4 600.03
3 4 600.04
My goal is to match the known distances with the measurements, like this.
C =
% From To DistHzPub
1 2 100
1 2 100
1 3 400
1 3 400
1 4 1000
1 4 1000
2 3 300
2 3 300
2 4 900
2 4 900
3 4 600
3 4 600
Creating an index by hand will get me there...
idx = [1 1 2 2 3 3 4 4 5 5 6 6]'
C = A(idx,:)
... but I'm having a hard time figuring out how to generate the index dynamically. Matrix A and B are subject to change in values, size, and order. Thank you.

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-12-6
编辑：Ameer Hamza 2020-12-6
It seems that you can just use round() on the 3rd column, but since that solution is so obvious, there might be some other reason that you want another solution.
[~, idx] = ismember(B(:,1:2), A(:,1:2), 'rows');
C = A(idx, :);
  1 个评论
bene1
bene1 2020-12-6
Perfect. Thank you!
(I simplified the values to understand the process. Rounding won't work with the real data).

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