Dear ALL,
I have a dataframe contains 4 columns and several 10 millions of rows like
below! I want to extract out randomly say 1 millions of rows, can you tell me
how to do that in R using base packages? Many Thanks
Col_1 Col_2 Col_3 Col_4
chr13000215 3000250 -
chr13000909
On Aug 1, 2014, at 1:58 PM, Stephen HK Wong hon...@stanford.edu wrote:
Dear ALL,
I have a dataframe contains 4 columns and several 10 millions of rows like
below! I want to extract out randomly say 1 millions of rows, can you tell
me how to do that in R using base packages? Many
Do you know how to extract some rows of a data.frame? A short answer
is with subscripts, either integer,
first10 - 1:10
dFirst10 - d[first10, ] # I assume your data.frame is called 'd'
or logical
plus4 - d[, Col_4] == +
dPlus4 - d[ plus4, ]
If you are not familiar with that sort of
3 matches
Mail list logo