[R] Puzzled over curve() syntax.

[Rolf Turner]

It's probably toadally elementary (and, like, duhhhhh) but
I can't figure out why the following doesn't work:

	curve(function(x){qnorm(x,4,25)},from=0,to=1)

I get the error:

	Error in xy.coords(x, y, xlabel, ylabel, log) : 
        'x' and 'y' lengths differ

But if I do

	foo <- function(x){qnorm(x,4,25)}
	curve(foo,from=0,to=1)

it goes like a train.

Also

	plot(function(x){qnorm(x,4,25)},from=0,to=1)

works just fine.

I'm using

 > version
         _                   
platform sparc-sun-solaris2.9
arch     sparc               
os       solaris2.9          
system   sparc, solaris2.9   
status                       
major    2                   
minor    2.0                 
year     2005                
month    10                  
day      06                  
svn rev  35749               
language R 

This is just idle curiousity I guess, but I would like to deepen my
understanding.  There's probably something about the ``expression''
concept that I'm not grokking here ....

Thanks for any insight.

			cheers,

				Rolf Turner
				rolf at math.unb.ca