[R] extraction from a list of vectors

[Robert.Denham@dnr.qld.gov.au]

>> Jeff Miller <jmiller at xcaliber.com> writes:

>> 	It's easy to do this using a for loop, but I need something that
>> will be fast for lists 
>> 	with lengths of about 100,000. I've thought about using lapply, but
>> don't see how I can use it with "myidx". 
>> 	Thanks in advance, 
>> 		Jeff Miller 


> nothing similar for a list of vectors of unequal length. So if you
> need the speed badly, I think you have to go to the C level. (A rather
> nicely sized little exercise for learning the .External interface, I
> would expect.)

I also find that a bit of preprocessing of the data using perl is useful for
large dataset manipulations, particularly if its something you need to do
only at the start.

Robert Denham
Queensland Department of Natural Resources



************************************************************************
The information in this e-mail together with any attachments is
intended only for the person or entity to which it is addressed
and may contain confidential and/or privileged material.

Any form of review, disclosure, modification, distribution
and/or publication of this e-mail message is prohibited.  

If you have received this message in error, you are asked to
inform the sender as quickly as possible and delete this message
and any copies of this message from your computer and/or your
computer system network.  
************************************************************************
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._