On 04/10/2009 12:41 PM, cls59 wrote:
Yihui Xie wrote:
Hi everyone,
I want to modify two base R functions 'parse' and 'deparse'
immediately after R has started, so I added some code in the file
'Rprofile.site' under the 'etc' directory. Here is a simple example:
Why not just modify their source, and rebuild R?
Duncan Murdoch
parse=function(...){
base::parse(...)
}
I'll get an error when I start R as follows:
Error: cannot change value of locked binding for 'parse'
Is there a solution for my problem? Please note that I *have to*
override the function names. Thanks very much!
Hi Yihui,
I have had cause to do some some similar things to Sweave functions-- maybe
the following will help:
# Find out where the function lives.
env <- as.environment( 'package:base' )
# Crack the binding.
unlockBinding( 'parse', env )
# Replace the function.
assignInNamespace( 'parse', function(...){
# Your function here, or an object that contains it.
}, ns = 'base' )
# Relock the binding.
lockBinding( 'parse', env )
Note that the above is *very* dark voodoo-- it may cause unforeseen
consequences.
Good luck!
-Charlie
-----
Charlie Sharpsteen
Undergraduate
Environmental Resources Engineering
Humboldt State University
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