Re: [R] how to post on R-help

That depends on the nature of your question. If it is about something only one person is likely to know the answer to, then a mailing list is not a good place to discuss it. Otherwise, I highly recommend reading the posting guide linked at the bottom of each email on the list, including this one

Re: [R] Merge Multiple Datasets

If your new datasets have similar measurements, you might consider rbind and adding a new column to distinguish the data sources. "Wang, Kevin (SYD)" wrote: >Hi, > >I've got a bunch of datasets (each has an "ID" column) that I'd like to >merge into one big datasets. > >After a google search I

Re: [R] sum specific rows in a data frame

This is good news, although I have recently encountered what I consider excessive memory usage in the addition of key columns that don't affect the number of groups. For example, grouping by Year and Month, if I add MonthBegin, a POSIXct column from which the Year and Month columns were derive