change the values in duplicate rows

General
1

I have created duplicate rows in dataset. Now i want to change some values in duplicate rows with out changing them in original rows.

is this code correct??

if (leve$time == 0) {print(leve2$DV == NA)}

and i also want to change some values in original rows with out changing them in duplicate rows.

Thankyou

2

If() is not vectorised so will only look at the first value given.
ifelse() is vectorised.
Read about it and see example by
?ifelse
In the console

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