[R] write.table

[Rolf Turner]

On 21/02/2009, at 12:54 AM, lauramorgana at bluewin.ch wrote:

> Thank you for your advice, but I didn't manage to make it work...
> I tried
>
> carichi.annui <- data.frame 
> (anno,loadPTG,loadPO4,loadNT,loadNH4,loadNO3,loadBOD5,loadSiO2)
>
> And I got this error message:
>
> Error in data.frame(anno, loadPTG, loadPO4, loadNT, loadNH4,  
> loadNO3,  :
>   the arguments have a different numer of rows: 4, 1
>
> If I do
>
> sapply(carichi.annui, class)
>
> I get:
>     anno  loadPTG  loadPO4   loadNT  loadNH4  loadNO3 loadBOD5  
> loadSiO2
>   "list"   "list"   "list"   "list"   "list"   "list"   "list"    
> "list"
>
> I thought that the function as.vector() could turn a list of  
> numbers into a vector... was I wrong?

Yes, you were wrong.  E.g.:

	> u <- list(1,2,3)
	> v <- as.vector(u)
	> class(v)
	[1] "list"
	> all.equal(u,v)
	[1] TRUE

Despite what some people (whose arrogance exceeds their wisdom) will  
try to tell you,
vectors can be considered to be lists.  At a certain level.

If you want to turn an object of class "list" into a ``real'' vector  
(e.g. of class
"numeric") use unlist():

	> w <- unlist(v)
	> class(w)
	[1] "numeric"
	> all.equal(w,1:3)
	[1] TRUE

	cheers,

		Rolf Turner


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