On Wed, 10 Mar 2010, Henrique Dallazuanna wrote:

On Wed, Mar 10, 2010 at 7:50 PM, Thomas Lumley <tlum...@u.washington.edu> wrote:
On Wed, 10 Mar 2010, baptiste auguie wrote:

Hi,

it's generally considered a bad practice but try this,

eval(parse(text=AA))

library(fortunes)
fortune(106)

HTH,

baptiste

On 10 March 2010 07:46, jq81 <jingqia...@gmail.com> wrote:

My question is represented by the following example.

For example, I have a character string a, which is defined as

AA="list(x=1, y=2)"

I want to take out the content of AA by using some function, so that I
can
obtain the following expression automatically.

list(x=1, y=2)


This is the situation where it isn't considered bad practice.  If someone
hands you a string with code in it, the only way to parse it is with
parse().

I think that Is there another way:

source(textConnection(AA))$value
closeAllConnections()


And if you look at the code for source(), you will see that it uses parse() and 
eval().

    -thomas

Thomas Lumley                   Assoc. Professor, Biostatistics
tlum...@u.washington.edu        University of Washington, Seattle
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