[R] Any container in R?
hustqiufeng at sohu.com
Mon Jan 1 19:45:11 CET 2007
Thank you very much! I checked out unique(), it does exactly what I
want. But I'm still curious about if R provides "STL"(standard template
----- 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 12:36 PM
Subject: Re: [R] Any container in R?
> On 1/1/2007 11:22 AM, Feng Qiu wrote:
>> 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.
> You might want to use the unique() function, or duplicated(), rather than
> doing this yourself.
> Duncan Murdoch
>> ----- 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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