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?