Find elements in a matrix
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
I have a very large matrix A with 4 columns and hundreds of thousands of rows - the first 3 columns contain x, y and z coordinates and the fourth column contains elevation values. I have another smaller matrix B of 3 columns containing x, y and z coordinates at which I need to extract the elevation values from the larger matrix. How do I search for the particular coordinates (given by B) in the larger matrix A? I tried to use 'find' to extract the indices of every match: >> ind=find(B==A(:,1:3))
but I get the error "Matrix dimensions must agree".
0 Commenti
Risposta accettata
the cyclist
il 31 Mag 2014
Modificato: the cyclist
il 31 Mag 2014
[tf idx] = ismember(B,A(:,1:3),'rows')
3 Commenti
the cyclist
il 31 Mag 2014
Modificato: the cyclist
il 31 Mag 2014
The second output of the ismember command gives the index to the corresponding row.
Più risposte (0)
Vedere anche
Categorie
Scopri di più su Resizing and Reshaping Matrices in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!