hi, I have a and data frame with date-column and some other columns. My first question is what is the fastest way to get the index of an array if I know the value f.e
> x = c(4,5,6,7,8) so i know the value is 6.. i.e. the index is 3. What I currently do is loop over the array, I was thinking if there is faster more direct way. The next one...is I have a data frame one of the columns is Date based (stored as string), as you may be guessed I have the date and I want to find the index ;), but here is one more complication. The dates are not sequential, but only dates when the day is Mon-Fri i.e. for Sat and Sun i don't store information. So I have first convert the date I have into the closest Monday. Let me give you one example. Let say I have the date 2000/01/01 (Sat), now to be able to find any information I have to find the nearest Monday in this case it is 2000/01/03 (Mon).. So now that I have this new date I can find the index of the element in the array where it is stored and from this I can get the real data I need. In short conversation is from Data ==> nearest Monday ==> index of the element in the array where it is stored. thank you very much ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
