[R] eval and assign in loop problem

[Patrick Connolly]

On Fri, 09-Jul-2010 at 08:25AM -0700, S.Nicholas wrote:

|> deaR useRs,
|> 
|> I am trying to assign different values to different objects in a for loop.
|> The following is a toy example of the part that has been giving me a hard
|> time.
|> 
|> The first "for loop" generates four objects, b0, b1, b2, b3 with random
|> numbers.
|> And, the second "for loop" is equivalent to
|> b1 = b0
|> b2 = b1
|> b3 = b2
|> b4 = b3

I don't quite get the idea, but would you be able to simply reverse
the order of those last 4 (for i in 3:0)?  That way, they won't all be
overwritten with b0.

HTH



|> 
|> But, when I run this code, the result is equivalent to
|> b1 = b0
|> b2 = b0
|> b3 = b0
|> b4 = b0
|> 
|> So, the increment does not seem to be properly working for the second part
|> of the "assign" function.
|> Why would this be?
|> 
|> for (i in 0:3)
|>        {
|>            r = runif(1)
|>            assign(paste('b',i,sep=''),r)
|>        }
|> 
|> 
|> for (i in 1:4)
|>        {
|> 
|> assign(paste('b',i,sep=''),eval(parse(text=paste('b',i-1,sep=''))))
|>        }
|> 
|> Thank you.
|> 
|> Nic
|> 
|> 	[[alternative HTML version deleted]]
|> 
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