[R] Variable names AS variable names?

[Noah Silverman]

My actual code is several things with adaptive filtering.  This will
require accessing data sporadically.  The loop was just a quick example
for the e-mail.

One application is to work with online (streaming) data.  If I get a new
data point in for code "a1", I'll need to be able to reference the
matrix named "a1". 

On 2/25/11 12:23 AM, David Winsemius wrote:
>
> On Feb 25, 2011, at 1:55 AM, Noah Silverman wrote:
>
>> How can I dynamically use a variable as the name for another variable?
>>
>> I realize this sounds cryptic, so an example is best:
>>
>> #Start with an array of "codes"
>> codes <- c("a1", "b24", "q99")
>
> Is there some reason not to use list(a1, b24, q99)? If not then:
>
> lapply(codes, somefun)
>
>
>>
>> #Each code has a corresponding matrix (could be vector)
>> a1 <- matrix(rnorm(100), nrow=10)
>> b24 <- matrix(rnorm(100), nrow=10)
>> q99 <- matrix(rnorm(100), nrow=10)
>>
>> #Now, I want to loop through all the codes and do something with each
>> matrix
>> for(code in codes){
>>    #here is where I'm stuck.  I don't want the value of code, but the
>> variable who's name is the value of code
>>
>> }
>>
>>
>> Any suggestions?
>>
>> -N
>>
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>
> David Winsemius, MD
> West Hartford, CT
>