how to get a value from a list (using paste function)?

Agreed.

But the initial question was to get the output with paste function. That is
the reason why I went for eval.

Please let me know in case I am going the wrong way

On Thu, Dec 27, 2012 at 4:34 PM, Jessica Streicher <j.streicher at micromata.de

wrote:

Well for one, if ever someone looks at your code, cvtest[[lambda.rule]] is
much easier to read and understand than
eval(parse(text=paste0("cvtest$",lambda.rule)))


On 27.12.2012, at 11:44, Heramb Gadgil wrote:

I am not sure why "Never ever!"

Can you please elaborate. What are the negatives about the method

Warm Regards,
Heramb M. Gadgil


On Thu, Dec 27, 2012 at 3:50 PM, Uwe Ligges <

ligges at statistik.tu-dortmund.de

wrote:

On 27.12.2012 08:09, Heramb Gadgil wrote:

eval(parse(text=paste0("**cvtest$",lambda.rule)))

No, never ever!

There is an R idiom made for it:

cvtest[[lambda.rule]]

Uwe Ligges







I hope this works.

On Wed, Dec 19, 2012 at 12:57 AM, Thomas Stewart
<tgs.public.mail at gmail.com>**wrote:

Soyeon-

A possible solution:

get(lambda.rule,envir=**list2env(cvtest))


On Tue, Dec 18, 2012 at 12:34 PM, Soyeon Kim <yunni0731 at gmail.com>
wrote:

Dear my R friends,

I want to get a number from a list using paste function.
In my example,
lambda.rule <- "lambda.1se"
cvtest is a list (result from cv.glmnet)
and
cvtest$lambda.1se
[1] 1.308973

I want to call the value using paste function.
I used get function but there was an error.
test <-  get(paste("cvtest$",lambda.**rule, sep=""))
Error in get(paste("cvtest$", lambda.rule, sep = "")) :
   object 'cvtest$lambda.1se' not found

Do you guys know how to solve this issue?

Thank you so much in advance and merry Christmas!

Soyeon