[R] Question on "assign(paste.."

[Rolf Turner]

Try:

	for(t in 4) { # Did you mean ``1:4''?
		nm <- paste("Trt",sep="")
		assign(nm,rmultinom(10,size=5,prob=probTrt[t,]))
		print(rowMeans(get(nm)))
	}

Notes:

	(1) You were missing the ``get(t)''; I introduced ``nm'' to save  
some typing.

	(2) You need the print() inside the for loop, or you won't see any  
results.

	(3) The letter ``t'' is a bad name for an index, since it is the  
name of the
	transpose function.  No *real* harm, but a dubious practice.

	(4) You'd probably be better off using a list, rather than constructing
	    a sequence of names.  As in

	Trt <- list()
	for(i in 1:4) {
		Trt[[i]] <- rmultinom(10,size=5,prob=probTrt[t,])
		print(rowMeans(Trt[[i]])
	}

		cheers,

			Rolf Turner


On 5/03/2008, at 1:44 PM, Kyeongmi Cheon wrote:

> Hello,
> I'm having trouble in using "assign(paste ..." command . I could  
> create
> several dataframes following trinomial distribution using it but it  
> could
> not be used to check their row means of the created dataframe.
>
> For example, the following works:
>
> probTrt=matrix(0,4,3);
> probTrt;
> #malf, death, normal
> probTrt[1,]=c(0.064,0.119,0.817);#for Trt 1
> probTrt[2,]=c(0.053,0.125,0.823);#for Trt 2
> probTrt[3,]=c(0.111,0.139,0.750);#for Trt 3
> probTrt[4,]=c(0.351,0.364,0.285);#for Trt 4
> for (t in 4){
>         assign(paste("Trt",t,sep=""),rmultinom(10, size = 5,
> prob=probTrt[t,]));
>     }
>
>
>
> But the following does not work.
> for (t in 4){
>         assign(paste("Trt",t,sep=""),rmultinom(10, size = 5,
> prob=probTrt[t,]));
>         rowMeans(paste("Trt",t,sep=""));
>     }
>
>
> How can I use it in functions like rowMeans so that I don't have to  
> type all
> the object names? Thank you.
>
> Kyeongmi
>
> 	[[alternative HTML version deleted]]
>
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