two arrays mapping value
4 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Hi, I have two arrays A=[1 0.1452; 2.1 0.2487; 3.2 0.3478; 4.8 0.41123] and B=[0.4 0.5 2.5 3.5 1.7]. I wanna get the mapping value of B from A. The rule is to find the ceil value of B in first column of A and return value in second column of A.For example, the ceil value of 1.7 in first column of A is 2.1, so the mapping value is 0.2487. Finally, the mapping value of B is [0.1452 0.1452 0.3478 0.41123 0.2487]. The size of B is over 10000. Please tell me the faster and more efficient method to solve it. Thanks
0 Commenti
Risposta accettata
Vishal Rane
il 25 Set 2013
A((A(:,1) == min(A(A(:,1) > B(1)))),2)
1 Commento
Vishal Rane
il 25 Set 2013
Modificato: Vishal Rane
il 25 Set 2013
run this in a for loop by indexing B(i) or use this
arrayfun( @(x)( A((A(:,1) == min(A(A(:,1) > x))),2)), B)
Più risposte (1)
Jan
il 25 Set 2013
Modificato: Jan
il 25 Set 2013
B(B > max(A(:, 1)) = NaN; % B too large
[dummy, index] = histc(B, [-Inf, A(:, 1).']);
outOfRange = (index == 0)
Result = A(index(~outOfRange), 2);
I cannot test this currently. Please care about the exceptions like values of B, which are greater or equal the maximum value of A. The CEIL criterion is not fulfilled, when an element of B is exactly contained in A. But HISTC is the general way to go through.
0 Commenti
Vedere anche
Categorie
Scopri di più su Matrix Indexing in Help Center e File Exchange
Prodotti
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!