R devel - May 2002 - masking

Dear R developers,

I am newbie to R-development.

I have written mutated the rpart to obtain myown package that performs some
additional calculations
on trees.  I have altered the names of rpart's functions so there is no
namespace conflict, but there
is redunant functionality.  However there some remaining functions that I am not
sure what to do with.

When I run R and load both libraries I get masking:

> library(dI)
> library(rpart)
Attaching package `rpart':


	The following object(s) are masked from package:dI :

	 is.Surv string.bounding.box tree.depth 


There is conflict because of the zzz.R file


% less  zzz.R
.First.lib <- function(lib, pkg) library.dynam("dI", pkg, lib)

is.Surv <- function(x) inherits(x, "Surv")

tree.depth <- function (nodes)
{
    depth <- floor(log(nodes, base = 2) + 1e-7)
    as.vector(depth - min(depth))
}

string.bounding.box <- function(s)
{
    s2 <- strsplit(s, "\n")
    rows <- sapply(s2, length)
    columns <- sapply(s2, function(x) max(nchar(x)))
    list(columns=columns, rows=rows)
}


My question:

1.  Why is the functionality of the 'zzz.R' file needed?

2.  How do I retain it without creating conflicts with rpart proper?


thanks in advance for your help,

Clayton
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On Tue, 28 May 2002, Clayton Springer wrote:
>
> % less  zzz.R
> .First.lib <- function(lib, pkg) library.dynam("dI", pkg, lib)
>
> is.Surv <- function(x) inherits(x, "Surv")
>
> tree.depth <- function (nodes)
> {
>     depth <- floor(log(nodes, base = 2) + 1e-7)
>     as.vector(depth - min(depth))
> }
>
> string.bounding.box <- function(s)
> {
>     s2 <- strsplit(s, "\n")
>     rows <- sapply(s2, length)
>     columns <- sapply(s2, function(x) max(nchar(x)))
>     list(columns=columns, rows=rows)
> }
>
>
> My question:
>
> 1.  Why is the functionality of the 'zzz.R' file needed?
To provide functions that aren't in base R but are needed by rpart. For
example, is.Surv is only in the survival package.
> 2.  How do I retain it without creating conflicts with rpart proper?
You could require rpart to be loaded, in which case your package wouldn't
need to contain these functions. (add require("rpart") to the
.First.lib
function)

It may be that you don't need these functions, in which case you can just
remove them

Otherwise you're stuck -- you need the functions in your package and rpart
needs them, so you will get the warning when both are loaded together.
This is fairly harmless.

	-thomas

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