Hi Duncan: Luke's article is in the June,  2003 edition of R-news

On Mon, Nov 15, 2010 at 8:43 PM, Duncan Murdoch <murdoch.duncan@gmail.com>wrote:

> Hadley Wickham wrote:
>
>> Hi all,
>>
>> I'm trying to understand how the search path and namespaces interact.
>> For example, take the devtools package which suggests the testthat
>> package.  Here's what the search path looks like after I load each of
>> those packages:
>>
>
> Luke Tierney wrote up a nice description of this a few years ago.  It's
> either on developer.r-project.org, or in an old issue of R News.
>
> Duncan Murdoch
>
>
>>  library(devtools)
>>> search()
>>>
>>  [1] ".GlobalEnv"        "package:devtools"  "package:stats"
>>  [4] "package:graphics"  "package:grDevices" "package:utils"
>>  [7] "package:datasets"  "package:methods"   "Autoloads"
>> [10] "package:base"
>>
>>> library(testthat)
>>> search()
>>>
>>  [1] ".GlobalEnv"        "package:testthat"  "package:devtools"
>>  [4] "package:stats"     "package:graphics"  "package:grDevices"
>>  [7] "package:utils"     "package:datasets"  "package:methods"
>> [10] "Autoloads"         "package:base"
>>
>> My question is this: when I execute the test function in devtools
>> function it calls the the test_package function in the testthat
>> package - but that function is located higher up the search path - how
>> does R find it?
>>
>> (I ask this question because I'm trying to simulate package loading
>> from within R to simplify the development cycle, but something is
>> missing in my knowledge of namespaces, and so I have the devel
>> versions of my packages can't access packages that are loaded after
>> they are)
>>
>> Hadley
>>
>>
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