Asked by Nicolo Zaza
on 21 Jul 2012

Alright so I have counting algorithm but i need it to extract elements from an original source and after extracting them and storing I need matlab to discard them so they dont get count again. How do i do this? My code: if true

DATA = [ 60 0 40 -20 40 -40 50 -30 30 -60 0 -30 40 -30 60]; L = length(DATA); E = [1:L]; N = 1; while N < L N = N + 1; if N < 3 continue end X(N) = [abs(DATA(N)-DATA(N-1))]; Y(N) = [abs(DATA(N-1)-DATA(N-2))]; if X < Y continue else RANGE(N) = Y(N); XMEAN(N) = [.5*(DATA(N-1)+DATA(N-2))] DATA (N -2) = [] DATA (N-1) = [] N = N - 2 end for I = N:L L = L - 2 E(I) = E(I+1); end end end

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Answer by Image Analyst
on 21 Jul 2012

Edited by Image Analyst
on 21 Jul 2012

Yes, that will delete elements but you're indexing elements and that will change, not to mention the length of your DATA array keeps getting shorter as you delete elements to eventually as N approaches L you'll get an index out of range error.

What are you really trying to do? Can't you just extract arrays and subtract them, and use diff? Or use hist if you want to count values?

data_n = DATA(3:end) data_nm1 = DATA(2:end-1) data_nm2 = DATA(1:end-2) X = abs(data_n - data_nm1) Y = abs(data_n - data_nm2) RANGE = y xMean = 0.5 * (data_nm1 - data_nm2) % I have no idea what E is supposed to represent.

Nicolo Zaza
on 21 Jul 2012

Image Analyst
on 21 Jul 2012

Have you seen this: http://www.mathworks.com/matlabcentral/fileexchange/3026?

Nicolo Zaza
on 21 Jul 2012

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## 1 Comment

## Nicolo Zaza (view profile)

Direct link to this comment:http://nl.mathworks.com/matlabcentral/answers/44186#comment_90870

Sorry to not finish expressing my question. So what I'm using right now is if true