Clear Filters
Clear Filters

Comparing arrays and getting the index of extra rows

2 views (last 30 days)
There are two arrays: A with 8916x3 and B with 6571x3. Each 1x3 set represents xyz coordinates. Array A has some extra coordinates/rows.
I want to compare xyz row by row, and return the index of rows in A that do not exist in B. Then use this index to remove the corresponding extra data from array C (basically C is 8916x3 and it has to be 6571x3 same as B, while keeping the order of rows).
Here's my code but I ge this error: "too many outputs"
[logic,index] =not(ismember(A,B,'rows'))
C(index,:) = [];

Accepted Answer

DGM
DGM on 2 Nov 2021
Consider:
% example arrays
B = randi(99,5,3)
B = 5×3
78 21 35 61 79 55 47 76 4 33 86 80 72 26 38
A = [B; randi(99,3,3)];
A = A(randperm(size(A,1)),:)
A = 8×3
78 21 35 61 79 55 10 40 11 55 76 42 50 65 26 72 26 38 47 76 4 33 86 80
% i'm assuming C is some separate array?
C = rand(size(A))
C = 8×3
0.5299 0.1604 0.0717 0.6433 0.3189 0.3384 0.6323 0.7470 0.2365 0.1172 0.1725 0.8113 0.3856 0.8772 0.6111 0.0621 0.1053 0.8808 0.9019 0.1290 0.7942 0.0757 0.7127 0.5547
% extract rows from C where A is a member of B, preserving order
C = C(ismember(A,B,'rows'),:)
C = 5×3
0.5299 0.1604 0.0717 0.6433 0.3189 0.3384 0.0621 0.1053 0.8808 0.9019 0.1290 0.7942 0.0757 0.7127 0.5547

More Answers (0)

Categories

Find more on Matrices and Arrays in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!