On Dec 3, 2009, at 10:52 PM, Gray Calhoun wrote:
The data import/export manual can elaborate on a lot of these; this is
all straightforward, although many people would prefer to use a
relational database for some of the things you mentioned.
See Wickham's pithy response to this.
I'm not
aware of a "goto" command in R, though (although I could be wrong).
In fairness to the OP, he did not ask if there were a go-to construct,
but rather whether there were a "gosub" construct that supported
"modular programming". My response would have been that calling
modular functions (i.e., subroutines with defined arguments) is
fundamental to R and the key to understanding how to use it with grace
and efficiency. I would say that the concept of functional programming
is to a much greater extent supported by R than by SAS, whose datastep
mechanisms (as I remember them from earlier incarnation) in no way
supported modular programming. I suspect that S and R arose precisely
because of the mental straightjackets imposed by SAS.
--
David.
--Gray
On Thu, Dec 3, 2009 at 1:52 PM, John Filben <johnfil...@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
John Filben
Cell Phone - 773.401.2822
Email - johnfil...@yahoo.com
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