Plotting only few indices over time series

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I wanted to highlighted with a different marker may be, over a plot only for a fewer indices over time series.
e.g. for a time series x having size(x) = 400 x 1
plot(x) first and highlight only set of indices y = [28,300,349,388,389] over the original curve.
I tried to find the solutions on mat exchange but couldn't. Any help would do please?

Accepted Answer

Mathieu NOE
Mathieu NOE on 15 Dec 2021
my 2 cents suggestion :
n = 1:500;
x = n.*(1+rand(size(n)));
ind = [28,300,349,388,389];

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