On Feb 25, 2011, at 1:09 PM, David Winsemius wrote:
On Feb 25, 2011, at 12:33 PM, Noah Silverman wrote:
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".
So, how do these things you are calling "codes" get their names?
("code" is not an R datatype. a1 is a matrix, "a1" is a character
value and it would be returned by names(a1). )
That's not correct. names(a1) would not return "a1" but names(codes)
[1] would if defined as a list as below.
a1 <- matrix(rnorm(100), nrow=10)
b24 <- matrix(rnorm(100), nrow=10)
q99 <- matrix(rnorm(100), nrow=10)
codes <- list(a1=a1, b24=b24, q99=q99)
str(codes[['a1']])
... should be a matrix
Assignment also works with "[[" or with "[".
We really _do_ need examples that represent the problems posed on
the list. You have been posting a sufficient number of times to have
understood this by now.
-- David
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"
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
David Winsemius, MD
West Hartford, CT
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David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
