Sérgio Nunes napsal(a): > Hi, > > I have several files with data in this format: > > 20070102 > 20070102 > 20070106 > 20070201 > ... > > The data is sorted and each line represents a date (YYYYMMDD). I would > like to analyze this data using R. For instance, I would like to have > a histogram by year, month or day. > > I've already made a simple Perl script that aggregates this data but I > believe that R can be much more powerful and easy on this kind of > work. > > Any suggestions on where to start? > > Thanks in advance, > Sérgio Nunes
Analysing a particular day is easy - just call e.g. hist(your.variable[day==20070101]) if 'day' contains the date stored as an integer. If you want to do this for all days probably you mmight use a loop through unique(day) Finally, to do a monthly/yearly analysis, just create 'month' and 'year' month <- trunc(day/100) year <- trunc(day/10000) HTH Petr Klasterecky -- Dept. of Probability and Statistics Charles University in Prague Czech Republic ______________________________________________ R-help@stat.math.ethz.ch 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.
