On 6/13/2008 10:07 AM, james perkins wrote:
Hi,
I have a very simple problem but I can't think how to solve it without
using a for loop and creating a large logical vector. However given the
nature of the problem I am sure there is a "1-liner" that could do the
same thing much more efficiently.
bascially I have a dataframe with characters in, eg
>names.and.numbers
(index) Name Fave.Number
1 John 7
2 Tony 12
3 Phil 14
4 Adam 22
5 Robert 23
Now, imagine I have a vector of names, ie:
>names = c("John,Phil,Robert")
All I want to do is get the subset of the dataframe which corresponds to
the names in the vector "Names". IE
(index) Name Fave.Number
1 John 7
2 Phil 14
3 Robert 23
Sorry, I know its trivial but I'm new to R and its hard to start
thinking in R, as I say, I've written a complicated for loop using
intersect and creating a logical table, but this is very long winded!!!
How about this:
subset(names.and.numbers, Name %in% mynames)
where mynames is the vector of names you want?
?subset
?is.element
Regards,
Jim
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