[R] "get" problem

[David Winsemius]

On Feb 24, 2010, at 4:31 PM, Georg Ehret wrote:

> Dear R communtiy,
>   I do not understand why this does not work...:
>
>> betaS$SBP
> [1]  0.03274 -0.04216 -0.08986 -0.45980  0.60320 -0.63070 -0.05682   
> 0.20130
>> t<-c("betaS$SBP")
>> t
> [1] "betaS$SBP"
>> get(t)
> Error in get(t) : object 'betaS$SBP' not found

A couple of different ways of passing multi-element objects to loops:

 > tt <- scan()
1:  0.03274 -0.04216 -0.08986 -0.45980  0.60320 -0.63070 -0.05682   
0.20130
9:
Read 8 items
 > tt
[1]  0.03274 -0.04216 -0.08986 -0.45980  0.60320 -0.63070 -0.05682   
0.20130
 > for (xi in seq(tt)) print(xi)
[1] 1
[1] 2
[1] 3
[1] 4
[1] 5
[1] 6
[1] 7
[1] 8
 > for (xi in seq(tt)) print(tt[xi])
[1] 0.03274
[1] -0.04216
[1] -0.08986
[1] -0.4598
[1] 0.6032
[1] -0.6307
[1] -0.05682
[1] 0.2013

 > beta <-list()
 > beta$SBP <- tt
 > beta["SBP"]
$SBP
[1]  0.03274 -0.04216 -0.08986 -0.45980  0.60320 -0.63070 -0.05682   
0.20130

 > for (xi in seq_along(beta$SBP) ) print(xi)
[1] 1
[1] 2
[1] 3
[1] 4
[1] 5
[1] 6
[1] 7
[1] 8

 > for (xi in beta$SBP)  print(xi)
[1] 0.03274
[1] -0.04216
[1] -0.08986
[1] -0.4598
[1] 0.6032
[1] -0.6307
[1] -0.05682
[1] 0.2013

-- 
David.
>
>
> [I am trying to use the variable "t" in a loop to call many different
> objects, but the pasting together did not work and this simple  
> example does
> not neither...]
>
> Thank you and best regards, Georg.
> *******************
> Georg Ehret
> JHU
> Baltimore
>
> 	[[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT