Clear Filters
Clear Filters

Subtract two values of an array and multiply them by a constant

2 views (last 30 days)
A = B_Oscilloscope; % Data (1007x94 array)
for k = 1:size(A,2)
[pks, locs] = findpeaks(A(:,k));
[~,ix] = sort(pks);
minpk{:,k} = [pks(ix(1:2)) locs(ix(1:2))];
maxpk{:,k} = [pks(ix(end-1:end)) locs(ix(end-1:end))];
maxpk{1} % View Result
minpk{1} % View Result
Hi everyone! Here is my current code:
This creates 2 1x94 arrays with my data (Minimums and Maximums), and each cell contains a 2x2 matrix (second peak and its indice, and first peak and indice). I need to go into each of those matrixes in the arrays and subtract the second entry in the first row by the second entry in the second row, and multiply it by a constant. Similary for both of the arrays I need to subtruct the 1st entry in the minmum row from the 1st in the second, the 2nd entry in the minimum row from the 2nd in the maximum row.
I hope that makes sense.
Fifteen12 on 1 Dec 2022
It might help if you provide an example of what you'd like to do! Is the constant scalar the same for every cell?

Sign in to comment.

Accepted Answer

Fifteen12 on 1 Dec 2022
Edited: Fifteen12 on 1 Dec 2022
If you put everything into an array (rather than a cell array) you can do logial indexing:
constant = 2;
minpk = [randi(10, 2), randi(10, 2), randi(10, 2)]
minpk = 2×6
5 1 2 2 4 5 8 4 1 4 6 7
out = constant * (minpk(1, 2:2:length(minpk)) - minpk(2, 2:2:length(minpk)))
out = 1×3
-6 -4 -4
  1 Comment
Troth on 1 Dec 2022
For some reason turning it into an array never even occured to me and would make it much easier, thank you!

Sign in to comment.

More Answers (0)


Find more on Resizing and Reshaping 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!