R help - Mar 2007 - how to avoid to overwrite object

Dear R list,
I have a question in R, it could be very simple, but I don't know how to do
it?

for example:
I assign 6 to x in beginning of of my R script code
 > x<-6
......
After many line code, I forget using x variable before, I use x 
again, and do assignment like this
 > x<-45
 > x
[1] 45

then value 6 of previous x is replaced by 45.

I am wondering if there are some way R can give me warning like
"x is used before, overwrite it or not?" when I use x again?

Thanks,

Aimin

Decompose your code into small understandable functions.

On 3/7/07, Aimin Yan <aiminy at iastate.edu>
wrote:
> Dear R list,
> I have a question in R, it could be very simple, but I don't know how
to do it?
>
> for example:
> I assign 6 to x in beginning of of my R script code
>  > x<-6
> ......
> After many line code, I forget using x variable before, I use x
> again, and do assignment like this
>  > x<-45
>  > x
> [1] 45
>
> then value 6 of previous x is replaced by 45.
>
> I am wondering if there are some way R can give me warning like
> "x is used before, overwrite it or not?" when I use x again?
>
> Thanks,
>
> Aimin
>
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