With the help of Andrie on StackOverflow.com, I was able to learn about
ddply. I have another question that is more trivial and cannot seem to find
help on IRC and do not want to bother Andrie again. I can't seem to figure
out what to google for, so I thought I'd ask here.
I have:
library(plyr)
df_diff <- ddply(df, .(SOURCE), summarize,
TIME_DIFF=-unclass(diff(REQUEST_DATE)))
df_diff
SOURCE TIME_DIFF
1 A 7.55
2 A 5.55
3 A 3.40
4 D 35.00
5 D 563.00
6 D 37.00
7 D 35.00
8 D 996.00
... with a lot more records.
I want to essentially sort SOURCE asc, TIME_DIFF asc and output the top 15
lowest TIME_DIFFS for each SOURCE. How do I do this?
Also, what is the data type of df_diff called so that I can look into it
some more?
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