[R] Help understanding behavior of apply vs sapply

[Seth Falcon]

Hi,

I was surprised that apply and sapply don't return the same results in
the example below.  Can someone tell me what I'm missing?


> zls <- function(x) character(0)
> m <- matrix(0, nrow=2, ncol=2)
> apply(m, 1, zls)
character(0)
> sapply(m, zls)
[[1]]
character(0)

[[2]]
character(0)

[[3]]
character(0)

[[4]]
character(0)






> R.version
               _                                      
platform       powerpc-apple-darwin8.5.0              
arch           powerpc                                
os             darwin8.5.0                            
system         powerpc, darwin8.5.0                   
status         alpha                                  
major          2                                      
minor          3.0                                    
year           2006                                   
month          03                                     
day            27                                     
svn rev        37590                                  
language       R                                      
version.string Version 2.3.0 alpha (2006-03-27 r37590)