removing the first digit of a string for the first n rows in a column

user_12171519 0
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I have a long column with about 5000 rows and each row has 6 digits. I would like to remove the first digit of the first 150 rows. How do I do that?

I tried this function: 

gsub("^[0-9]","", f1992$cleaned1992)

f1992 is the dataframe and cleaned1992 is the column that I am working with. The problem is the code removes the first digit for all the 5000 rows.

Screenshot of the data

r
2 Answers

Just index to the first 150 rows

 gsub("^[0-9]","", f1992$cleaned1992[1:150])
user_27068260

With sub you can do

f1992$cleaned1992[1:150] <- sub(".", "", f1992$cleaned1992[1:150])

Or using substring

f1992$cleaned1992[1:150] <- substring(f1992$cleaned1992[1:150], 2)
user_39629140
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