[R] Apply function to column of array

Paul Boutros pcboutro at engmail.uwaterloo.ca
Tue Oct 29 21:32:57 CET 2002

Hi all,

I would like to apply a function to each column of an 2-dimensional array,
and store the result in a new 1-dimensional vector.  I am not sure how to
go about doing that syntatically.  For instance, can I use lapply?  And,
if so, how do I specify which dimension should be used?  Also, how do I
pre-specify the type of object that will go into the 1-dimensional vector.

I'm not sure if it is important, the function I wish to apply to the
columns is density().  Additionally, I wish to be able to take these
density objects (stored in that 1-dim vector) and place them onto a
multiple-figure environment.

I'm new with R, so I tend to think in loops.  I'd appreciate any guidance
or tips on better ways to handle this problem.


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