Hi Brendan,
If you really, really want to work with the for() loop, then

for(i in 1:10){
            assign(paste("theta1_",i,sep=""),data.frame(scale(rnorm(250))))
            assign(paste("theta2_",i,sep=""),data.frame(scale(rnorm(250))))
            assign(paste("theta3_",i,sep=""), get(paste("theta1_",i,sep=""))
+ get(paste("theta2_",i,sep="")))
            }

should work. I would rather prefer to work with list() as Duncan Murdoch
and Dimitri Liakhovitski pointed out.

See ?get for more details.

HTH,

Jorge


On Mon, Apr 20, 2009 at 2:35 PM, Brendan Morse <morse.brendan@gmail.com>wrote:

> Hi everyone, I am trying to calculate a particular variable (vector) from
> some previously defined variables in a loop but I am having trouble
> figuring
> out how to get the loop to recognize that it should index for the
> previously
> defined objects. Here is a simplified version of what I am trying to do:
>
> for(i in 1:10){
>
> assign(paste("theta1_",i,sep=""),data.frame(scale(rnorm(250))))
>
> assign(paste("theta2_",i,sep=""),data.frame(scale(rnorm(250))))
>                      assign(paste("theta3_",i,sep=""),data.frame(theta1_i +
> theta2_i)
>                   }
>
> I am having trouble with getting it to recognize that theta3_i should be
> calculated using theta1_i and theta2_i in the third line. In other words,
> theta3_1 should equal theta1_1+theta2_1 whereas theta3_2 should equal
> theta1_2+theta2_2
>
> Any advice as to where I am losing this one?
>
> Thanks,
> brendan
>
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>
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