character string as object name
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