Replace Data based on Casenumber

I have a dataset which I want to use to plot Causal Impact data using ggplot2. I want to replace the data with NA in the first 25 rows in one of the columns. Is that possible and if so, how?

your_dat[1:25,3] <- NA

For the first 25 rows of column 3

That works like a charm. Thank you very much.

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