[R] how to slice a zoo object

[Blair Sutton]

Hi

Would anyone have any pointers on how to slice up a large zoo table. I
have the following structure: -

> str(ZOO_OBJ)
 zoo [1:632, 1:83] 30.4 30.4 30.4 30.4 30.3 ...
 - attr(*, "dimnames")=List of 2
  ..$ : NULL
  ..$ : chr [1:83] "COL1" "COL2" "COL3" "COL4" ...
 - attr(*, "index")= POSIXct[1:632], format: "2009-05-01 01:00:00"
"2009-05-02 01:00:00" ...

and I would just like to take only arbitrary columns, i.e. another zoo
object with only the columns "COL2", "COL5", etc..

I've tried various syntactical combinations such as those for
data.frames and also tried manipulating the coredata(). What would be
nice would be the ability to do this by column names and not their
indexes.

Any help appreciated and thanks in advance,
Blair