Search Archives
Search tips
from:Name
Search by author name, e.g. from:Duncan Murdoch
"exact phrase"
Match an exact phrase
word1 word2
Match messages containing both words
Date range
Use the date pickers to filter results to a time period
Use the list dropdown to narrow results to a specific mailing list. Combine from: with other terms to filter by author and content.
How to sum one column in a data frame keyed on other columns
George Nachman
·
Dec 12, 2006
·
r-help
I have a data frame that looks like this: url time somethingirrelevant visits www.foo.com 1:00 xxx 100 www.foo.com 1:00 yyy 50 www.foo.com 2:00 xyz 25 www.bar.com 1:00 xxx...
How to sum one column in a data frame keyed on other columns
George Nachman
·
Dec 12, 2006
·
r-help
Thanks, everyone, for the help! Bill: This looks like a really great general solution, but unfortunately I get an error when I call sumUp: Error in "[.data.frame"(dat, , key_list, drop = FALSE) : invalid subscript type I'm running 2...
Can't find what you're looking for? Try searching with Google .