Scanning signal/Storing anything other then zeros

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Sebastian Daneli 2021-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/856025-scanning-signal-storing-anything-other-then-zeros

评论： Rik 2021-6-15

采纳的回答： Mathieu NOE

Hi

I have a filtered signal where the base line is zero that looks in principle like this:

[0 0 0 -1 2 -2 0 0 0 2 1 -1 0 0 0 2 3 1 0 0 0...]

I wish to scan the signal and store the structures within it in a matrix such as this one:

[-1 2 -2; 2 1 -1; 2 3 1;...]

Which is the most efficient way to do this? Can I use the find function efficiently for this?

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Rik 2021-6-15

Regarding your flag ("I asked this question, but realized I didn't ask the correct question that I need answered."): what do you want to happen? Should this thread be deleted just because you asked a different question from what you wanted?

If the answer didn't solve your actual problem, why did you mark it as accepted answer? You can post comments with clarifications to make sure you are making clear what you want to know.

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Answer 1

Mathieu NOE 2021-6-14

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在 MATLAB Online 中打开

hello

my suggestion / demo code :

I understand the output must be a matrix of 3 columns;

tol = eps; % set a tolerance value (very low but not zero)
a = [0 0 0 -1 2 -2 0 0 0 2 1 -1 0 0 0 2 3 1 0 0 0];  % input data
b = a(abs(a)>tol);  % remove zero (below tol) data
c = (reshape(b,[],3))'; % reshape in 3 columns matrix and transpose
c =
    -1     2    -2
     2     1    -1
     2     3     1