matrix normalization in matlab
119 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
hi.. i want normalize a matrix (129 x 128)..please help me with matlab codes
0 Commenti
Risposta accettata
Thorsten
il 30 Gen 2013
To normalize a matrix such that all values fall in the range [0, 1] use
Anorm = (A - min2(A))/(max2(A) - min2(A));
3 Commenti
DGM
il 11 Dic 2022
Modificato: DGM
il 11 Dic 2022
There ./ is not needed here, since the denominator is a scalar.
That said, there is no function called min2() or max2(), nor can I find evidence that there were functions by those names which have since been removed. Maybe they used to be part of one of the toolboxes.
Alternatively, you could do:
Anorm = (A - min(A(:)))/(max(A(:)) - min(A(:)));
or you could do
Anorm = (A - min(A,[],'all'))/(max(A,[],'all') - min(A,[],'all'));
though the latter option wouldn't have worked circa 2013
Più risposte (3)
Matt J
il 30 Gen 2013
You need to decide how you want to define the amplitude of the matrix first. Maybe you want this
normalized = A/norm(A);
or maybe this
normalized = A/max(abs(A(:)))
3 Commenti
Jan
il 30 Gen 2013
Please, jenifer, we have asked you to define "normalization" exactly. It wastes time if we guess what you mean.
Jing
il 30 Gen 2013
You can use 'normc' or 'normr' for normalization. 'c' or 'r' stands for columns or rows that you want to normalize.
0 Commenti
DGM
il 11 Dic 2022
A = 1:6
B1 = normalize(A,'range') % default range is [0 1]
B2 = normalize(A,'range',[-1 2]) % but you can specify any range
B3 = normalize(A,'zscore','std') % zero-center and scale to have std=1
B4 = normalize(A,'norm',2) % normalize by vector p-norm (default p=2)
0 Commenti
Vedere anche
Categorie
Scopri di più su Matrix Indexing 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!