[R] Overwriting a procedure

[Greg Snow]

A perhaps better approach would be to have the functions that
currently call fixx accept an argument of a function to use.  It could
default to fixx, but if the caller passed in a new function it would
use that function instead.

If you really want to overwrite a function inside of a package
namespace then look at the assignInNamespace function in the utils
package (but note the warning in the description on the help page).

On Tue, Sep 2, 2014 at 12:45 PM, Steven Yen <syen04 at gmail.com> wrote:
> Is there a way to over-write a procedure (subroutine)?
>
> I include a default procedure fixx in a list of procedures which are
> compiled into a package. By default, the procedure deliver the data matrix
> x.
>
> fixx <- function(x){
> result <- list(x=x)
> return(result)
> }
>
> In some applications, I have transformations (such as squared terms) in some
> column(s) in x. So I include the following procedure in the mail (calling)
> program, hoping to over-write the default procedure under the same name in
> the package (which is the way other languages works, e.g., Gauss):
>
> fixx <- function(x){
> x[,6]<-x[,5]^2/10
> result <- list(x=x)
> return(result)
> }
>
> This does not seem to work. The procedure in the main (calling) program
> seems to get ignored. Any idea? Thanks.
>
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-- 
Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com