On Dec 11, 2011, at 10:27 AM, Jinsong Zhao wrote:

Hi there,

I hope to modify values in a vector or matrix in the following code:

for (i in 1:9) {
  assign(paste("a.", i, sep = ""), 1:i)
  get(paste("a.", i, sep = ""))[i] <- i+50
}

Just one matrix? Then you seem to have inappropriately borrowed using "." as an indexing operation. In R that is just another character when used as an object name. "a.1" is notgoing to evaulate to a[1]. Look at what you would have had after

> for (i in 1:9) {
+   assign(paste("a.", i, sep = ""), 1:i)
+   }
> ls()
 [1] "a"                    "a.1"                  "a.2"
 [4] "a.3"                  "a.4"                  "a.5"
 [7] "a.6"                  "a.7"                  "a.8"
[10] "a.9"

> a.1
[1] 1
> a.2
[1] 1 2

Each of those assign() operations created a single vector of length i. I doubt that was what you intended,

Better would be to describe your objects and your intentions, rather than expecting us to understand your goals by just looking at code that doesn't achieve thos goals. (There is no `get<-` function which was the source of the error.)



I get the following error message:

Error in get(paste("a.", i, sep = ""))[i] <- i + 50 :
 target of assignment expands to non-language object

I have read the FAQ "How can I turn a string into a variable?", however, I don't find a way to deal with:

get(paste("a.", i, sep = ""))[i] <- i+50

Any suggestions? Thanks in advance!

Regards,
Jinsong

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