Tim Smith wrote:
> Hi,
>
> I was trying to pass in a parameter (on the fly), but am unable to
figure out how to get what I want. Here is what I want:
>
> xx <- as.list(hgu95av2SYMBOL)
>
>> length(xx)
>>
> [1] 12625
>
> However, when I try to build the string on the fly and pass it as a
parameter, for example:
>
>
>> var <- 'hgu95av2'
>> tempVar <- paste(var,'SYMBOL',sep='')
>> yy <- as.list(tempVar)
>> length(yy)
>>
> [1] 1
>
>> tempVar
>>
> [1] "hgu95av2SYMBOL"
>
>
> I understand that in the second case, I have just created a string
and the results are not surprising!. But how do I get it to do what I
really want?
>
>
>
>
>
>
>
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Hi Tim,
I think that the function you want to use is get().
So for your example:
var <- 'hgu95av2'
tempVar <- paste(var,'SYMBOL',sep='')
#just add this function call into your flow to find the variable that
you seek
#(instead of the string which as you mentioned will NOT be what you
want):
foo = get(tempVar)
yy = as.list(foo)
length(yy)
#Which gives the answer that I think you wanted: [1] 12625
Let me know if this doesn't help,
Marc
On Mon, Mar 3, 2008 at 12:14 PM, Tim Smith <tim_smith_666 at="" yahoo.com=""> wrote:
> Hi,
>
> I was trying to pass in a parameter (on the fly), but am unable to
figure out how to get what I want. Here is what I want:
>
> xx <- as.list(hgu95av2SYMBOL)
> > length(xx)
> [1] 12625
>
> However, when I try to build the string on the fly and pass it as a
parameter, for example:
>
> > var <- 'hgu95av2'
> > tempVar <- paste(var,'SYMBOL',sep='')
> > yy <- as.list(tempVar)
> > length(yy)
> [1] 1
> > tempVar
> [1] "hgu95av2SYMBOL"
>
>
> I understand that in the second case, I have just created a string
and the results are not surprising!. But how do I get it to do what I
really want?
Close! You just missed one step (see ?get):
> library(hgu95av2)
> var <- 'hgu95av2'
> tempVar <- paste(var,'SYMBOL',sep='')
> y <- get(tempVar)
> yy <- as.list(y)
> length(yy)
[1] 12625
Hope that helps.
Sean
