Find set of all adjacent points that are close to each other

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Paul Hoffrichter
Paul Hoffrichter 2020-6-5
编辑： Paul Hoffrichter 2020-6-6
I would like to find in Y[n] a set of adjacent points that are close to each other, but I don't get all the desired points. For example.
Y = [ 1.1 1.12 9.2 8.3 8.295 8.292 4.1 4.12 4.19];
dY_idx = find(abs(diff(Y)) < 0.022);
Y_adj_close = Y(dY_idx)
This code results in:
Y_adj_close =
1.1000 8.3000 8.2950 4.1000
But I would like the result to be:
Y_adj_close =
1.1000 1.1200 8.3000 8.2950 8.2920 4.1000 4.12
How can I get the desired result? (Note: I probably could also do a Y = fliplr(Y) followed by a second round and then combine results to get all the unique points, but that would be two sets of operations on a large vector. Hoping for a faster solution.)

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Tommy
Tommy 2020-6-5
How about this?
logidx = abs(diff(Y)) < 0.022;
Y_adj_close = Y([logidx 0] | [0 logidx]);
Y_adj_close =
1.1000 1.1200 8.3000 8.2950 8.2920 4.1000 4.1200
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Paul Hoffrichter
Paul Hoffrichter 2020-6-6
编辑：Paul Hoffrichter 2020-6-6
My new question deals with my need to keep dimension of x and y the same. I forgot to mention that in this question. I used your answer here to work out an answer that works. Just wondering whether it can be modified to perform better.
https://www.mathworks.com/matlabcentral/answers/543197-plot-only-adjacent-points-that-are-close-to-each-other
Just using plot in the question to ensure dimensions match, and provide a quick sanity check.

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