How to normalize rows of a matrix?
4 views (last 30 days)
Show older comments
Kimberly Cardillo
on 19 Aug 2020
Answered: Steven Lord
on 19 Aug 2020
I have a matrix called aefm_1 that is 184 x 5119 where each row indicates a signal vector and each column is a time step and each value in the signal vector indicates amplitude at that time step. I want to write a loop that normalizes each signal vector in the matrix from -1 to 1 based on the maximum amplitude for each row. When I try to use the code below, it outputs only a singal vector of dimensions 1 x 5119. In the end, I want an output that is still 184 x 5119. How do I do that?
for i=1:size(aefm_1,1)
aefm_2 = aefm_1(i,:)./max(abs(aefm_1(i,:)));
end
0 Comments
Accepted Answer
Geoff Hayes
on 19 Aug 2020
Kimberley - your code is overwriting the value that was assigned to aefm_2 on the previous iteration
aefm_2 = aefm_1(i,:)./max(abs(aefm_1(i,:)));
You will need to set this variable to be an array with the same dimensions as aefm_1 and then update each row of it. Alternatively, you could probably do this in a single line of code without a loop.
aefm_2 = aefm_1 ./ max(abs(aefm_1), [], 2);
0 Comments
More Answers (1)
Steven Lord
on 19 Aug 2020
Are you required to use a loop? If not, take a look at the normalize function.
0 Comments
See Also
Categories
Find more on Creating and Concatenating Matrices in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!