Index one multidimensional array using another
3 views (last 30 days)
Show older comments
Hello,
Sorry for the basic question, but I couldn't find an answer on this forum.
Let's say I have two 4D arrays:
A = rand(3,5,4,2);
B = rand(3,5,4,2);
I want to get the max values in A along the third dimension and then pull the corresponding values out of B. What I tried to do was:
[maxs, maxs_ix] = max(A,[],3);
B(maxs_ix);
But this didn't give me the right answer. As a check, I would expect that the following two lines should return the exact same array, but they don't:
maxs;
A(maxs_ix);
Can someone explain what I'm missing, and how to get the values from B that are in the same positions as the maxs of A?
0 Comments
Accepted Answer
Walter Roberson
on 31 Oct 2022
The indices you get back from max are relative to the dimension searched over, except when you use the relatively new 'linear' or 'all' options.
Generally speaking if you get back an index relative to a dimension you typically end up needing to use sub2ind() or doing index arithmetic.
More Answers (0)
See Also
Categories
Find more on Matrix Indexing in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!