[R] Data Manipulation Question

[hadley wickham]

On Thu, Dec 3, 2009 at 3:52 PM, John Filben <johnfilben at yahoo.com> wrote:
> Can R support data manipulation programming that is available in the SAS datastep?  Specifically, can R support the following:
> -          Read multiple dataset one record at a time and compare values from each; then base on if-then logic write to multiple output files
> -          Load a lookup table and then process a different file; based on if-then logic, access and lookup values in the table
> -          Support modular “gosub”programming
> -          Sort files
> -          Date math and conversions
> -          Would it be able to support the following type of logic:
> o   Start
> §  Read Record from File 1
> §  Read Record from File 2
> §  Match
> ·         If Key 1 <> Key 2 and Key 1 < Key 2, Write to output file A
> ·         If Key 1 = Key 2, Write to output file B
> ·         If Key 1 <> Key 2 and Key 1 > Key 2, Write to output file C§  Goto Start until File 1 Done

Yes.

Hadley


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