syntax for extending a line in a script??

Hello,

   A hopefully simple question.  I use 'R' through emacs, but I  
suspect the
following would occur with any manner of text editor:

  - my editor has a normally quite handy feature where it will
  automatically indent to the appropriate level when I start a new  
line.
  However, this occasionally creates cases where there is no  
friendly way to
  break a long line of code into two lines which still function as one
  command.  Therefore, I need a nice way to be able to flag 'R' to  
know that
  the code is continuing on the next line.  Let me explain via  
example:

       numericColumns <- names(listOfDataFrames[[myDF]][,columnsOI])[
                           sapply(listOfDataFrames[[myDF]] 
[,columnsOI],
                                  is.numeric) ]

   As you can see in this case, I would *like* for these 2 lines of  
code to
be read as 1 line, but since the "names(<blah>)" command is  
sufficiently a
command on its own, 'R' see this as a completed line of code.  I  
could try
to break it up at different points, but emacs (and other text  
editors) takes
a guess as to the most intelligent way to indent, so that if I were  
to write
something like:

       numericColumns <- names(listOfDataFrames[[myDF]][,columnsOI])
[sapply(
                     listOfDataFrames[[myDF]][,columnsOI],  
is.numeric) ]


it would actually indent something more like this:

       numericColumns <- names(listOfDataFrames[[myDF]][,columnsOI])
[sapply(

listOfDataFrames[[myDF]][,columnsOI], is.numeric) ]


and as you can see, that doesn't help the issue of preventing the  
code from
wrapping around (and therefore doesn't help readability).  Is there  
some
simple way to flag that the next line is continuing?  Something like
python's "\" at the end of a line?  I tried wrapping the whole thing  
around
curly braces { } but that didn't work, either.

                                          Thanks!
                                                  Mike


"Telescopes and bathyscaphes and sonar probes of Scottish lakes,
Tacoma Narrows bridge collapse explained with abstract phase-space  
maps,
Some x-ray slides, a music score, Minard's Napoleanic war:
The most exciting frontier is charting what's already here."
 -- xkcd

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