MATLAB Answers

Normalization of an array of double

49 views (last 30 days)
Guido Pastore
Guido Pastore on 3 Mar 2019
Edited: Stephan on 3 Mar 2019
How do I normalize an array of double from 0 to 1 ??

Accepted Answer

Stephan
Stephan on 3 Mar 2019
Edited: Stephan on 3 Mar 2019
Hi,
in R2018b use:
A = A ./ max(A,[],'all')
If you need performance use the good old classic way (see comment on the other answer):
A = A ./ max(A(:))
Best regards
Stephan
  1 Comment
madhan ravi
madhan ravi on 3 Mar 2019
max(A,[],'all') % since 2018b
max(A(:)) % prior to 2018b

Sign in to comment.

More Answers (1)

Sheng Chen
Sheng Chen on 3 Mar 2019
Try this
v = [1.3, 5.6, 2.2, 1.0, 3.32];
N = normalize(v,'range');
'range' means scale range of data to [0,1].
Also, please refer to Normalize data
  1 Comment
Stephan
Stephan on 3 Mar 2019
For bigger data sets i would prefer the classic way before 2018b changes came:
A = randi(100,10,10,10);
res_1a = @(A) A./max(A,[],'all');
res_1b = @(A) A./max(A(:));
res_2 = @(A) normalize(A,'range');
tic
r1a = res_1a(A);
toc
tic
r1b = res_1b(A);
toc
tic
r2 = res_2(A);
toc
results in:
Elapsed time is 0.000805 seconds.
Elapsed time is 0.000427 seconds.
Elapsed time is 0.057486 seconds.

Sign in to comment.

Tags

Community Treasure Hunt

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

Start Hunting!