[R] character string as object name

[Fuchs Ira]

I thought that's what I had:

 > b
[1] "MSFT$MSFT.Adjusted"
 > eval(as.name(b))
Error in eval(expr, envir, enclos) :
   object "MSFT$MSFT.Adjusted" not found

However, Patrick's suggestion of eliminating the '$' gave me what I  
was looking for:

 > b=paste(a,'.Adjusted',sep='')
 > eval(as.name(a))[,b]
            MSFT.Adjusted
2009-03-02         15.79
2009-03-03         15.88
2009-03-04         16.12

Thanks for your help.

On Mar 5, 2009, at 11:33 AM, Wacek Kusnierczyk wrote:

> Fuchs Ira wrote:
>> Can someone please tell me why the following (last line) doesn't work
>> (as I expect it to :-)
>>
>> library(quantmod)
>> a = getSymbols("MSFT",from="2009-3-01")
>> a
>> MSFT
>> eval(as.name(a))
>> MSFT$MSFT.Adjusted
>> b=paste(a,'$MSFT.Adjusted',sep='')
>> b
>> eval(as.name(b))
>>
>> Why does this last line not work the way the earlier eval does?
>>
>
> because eval(as.name(b)) looks for `MSFT$MSFT.Adjusted`, not for
> `MSFT`$`MSFT.Adjusted`:
>
>    'MSFT$MSFT.Adjusted' = 'rubbish'
>    eval(as.name(b))
>    # "rubbish"
>
> vQ