[R] Anyone can help with this question

[Mariana]

Hi there:
I am a total beginner in R, and I have a simple question:
I have a table with thousands of lines that represent locations, and two
columns: latitude and longitude. I need to randomly sample 1000 lines. How
do I do it? I know the command "sample", but it samples elements
independently, not lines. 
If there is a better place for me to ask that type of question, please let
me know.
Thanks a lot,
Mariana (from Brazil)

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