matlab - How to extract elements in an array that have multiple entries? -

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i have large vector contains monotonically increasing data or duplicate, looking this:

data = [0 1.1 2.2 3.3 4.4 4.4 4.4 4.4 5.5 6.6 6.6 6.6 7.7];

in data set, i'm interested in duplicate entries (in case, 4.4 , 6.6). have sorta clunky solution extract these values, feel matlab should have one-liner solution extract result like

result = [4.4 6.6];

the combination of unique , diff enough, find not necessary.

out = unique(data(~diff(data)))

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