> do.call(rbind, lapply(split(data, data$Name), function(x)
x[order(x$CheckInDate),][nrow(x),]))
Name CheckInDate Temp
John John 2014-04-01 99.0
Mary Mary 2014-03-01 98.1
Sam Sam 2014-04-01 97.5
>
Is this what you are looking for? I hope this helps.
Chel Hee Lee
On 01/23/2015 05:43 PM, Tan, Richard wrote:
Hi,
Can someone help for a R question?
I have a data set like:
Name CheckInDate Temp
John 1/3/2014 97
Mary 1/3/2014 98.1
Sam 1/4/2014 97.5
John 1/4/2014 99
I'd like to return a dataset that for each Name, get the row that is the latest
CheckInDate for that person. For the example above it would be
Name CheckInDate Temp
John 1/4/2014 99
Mary 1/3/2014 98.1
Sam 1/4/2014 97.5
Thank you for your help!
Richard
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