[R] Any container in R?

Feng Qiu hustqiufeng at sohu.com
Mon Jan 1 17:22:57 CET 2007

Hi Duncan:
         Thanks for your hints.
         I'm trying to collect distinct elements in one column in a matrix. 
If there is a map, I can easily build up such a collection. While if using 
list, I have to check by myself if this element already exists in the 
collection every time I examine a new entry in the column.



----- Original Message ----- 
From: "Duncan Murdoch" <murdoch at stats.uwo.ca>
To: "Feng Qiu" <hustqiufeng at sohu.com>
Cc: <r-help at stat.math.ethz.ch>
Sent: Monday, January 01, 2007 10:37 AM
Subject: Re: [R] Any container in R?

> On 1/1/2007 10:17 AM, Feng Qiu wrote:
>> R has list and array to contain elements. But does R have more powerful 
>> container, such as "map" as in C++ STL?  or is there such a package?
> In what way are maps more powerful than lists?  You can use names to index 
> lists.
> The other container in R is the environment; they have fairly strange 
> semantics, though.
> Duncan Murdoch

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