Xiaobo.Gu, > Can the plenty of analytical functions provided by base R and contributed > packages be called with ff objects as parameters directly, or do we have to > write special version of the functions for ff objects? If it is the latter > case, is there a list of functions which support ff objects already.Xiaobo.Gu ff is an add-on package that allows you to store and access larger datasets - its not part of the language. ff objects have different copy semantics than standard R objects (partially by reference) so it is unlikely that you can write R code that does use ff objects exactly the same way as with standard R objects.
There is no comprehensive list, but some functions allow ff objects, e.g. 'biglars' which you find if you look at the reverse-dependencies of ff on CRAN. Other functions are prepared to handle large datasets in chunks - like 'biglm' - and it is your responsibility to extract those chunks from ff, a database or whatever other source. HTH Jens Oehlschlägel ______________________________________________ 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.
