I have a data frame called df which has about 100 columns but thousands of
rows. I set D the index of df$D and M to be the index of df$M.
When I run the following loop as it is vs. df[,D] and df[,M] replaced with
df$D and df$M there is a real big time difference in completion (with the
latter
What are D and M? 'Index' here could be a number or a name.
In either case, df[[D]] would be the equivalent of df$D.
However, your computation does not need a loop at all, let alone two.
Try something like
tmp - with(df, paste(D, m))
dates - unique(tmp)
On Wed, 21 Feb 2007, Alp ATICI wrote:
