# Remove row if its value is not different enough from the value in the row above it.

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Aleya Marzuki on 16 Aug 2022
Commented: Aleya Marzuki on 16 Aug 2022
I have the table above. If the difference between latencies in one row is not much different from the latencies in the second row (difference <= 100), I would like to have the second row removed. To illustrate, row 305 would be removed in the table above because the difference in latencies between it and row 304 is less than 100. Would really appreciate suggestions on how best to do this, thank you!

Chunru on 16 Aug 2022
% Generate data
latency = [1000 1010 1020 1800]';
dur = zeros(size(latency));
type = ones(size(latency)) * 256;
T = table(latency, dur, type)
T = 4×3 table
latency dur type _______ ___ ____ 1000 0 256 1010 0 256 1020 0 256 1800 0 256
% diff
ldiff = diff(T.latency);
idx = find(ldiff <= 100) + 1;
T(idx, :) =[];
T
T = 2×3 table
latency dur type _______ ___ ____ 1000 0 256 1800 0 256
Aleya Marzuki on 16 Aug 2022
This worked really well thanks!!

Simon Chan on 16 Aug 2022
Let A be your matrix, try the following:
threshold = 100;
A([false;(diff(A(:,1))<=threshold)],:)=[];
Aleya Marzuki on 16 Aug 2022
Yup this worked too! Just needed to make a minor adjustment since A is a table:
A([false;(diff(A.latency)<=threshold)],:)=[];
Thank you!

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