[R] index question

[ronggui]

======= 2005-11-02 05:13:45 ÄúÔÚÀ´ÐÅÖÐÐ´µÀ£º=======

>Thanks for those on the list that answered my previous question.  I'm
>just about where I need to be (looking at output).  
>
>In the hier.part documentation there is a line env <- urbanwq[,2:8].  
>
>This means use rows 2 through 8 in the data frame "urbanwq", right? 
his means use columns 2 through 8 in the data frame "urbanwq"

>What does the comma represent? 
It means the first argument to function "[" is left blank,so makes R knows 2:8 is the second argument to "[".

> If one wasn't using column headers would
>this be necessary?
It still is necessary.

>
>Thanks,
>
>Jeff
>
>
>
>****************************************
>Jeffrey A. Stratford, Ph.D.
>Postdoctoral Associate
>331 Funchess Hall
>Department of Biological Sciences
>Auburn University
>Auburn, AL 36849
>334-329-9198
>FAX 334-844-9234
>http://www.auburn.edu/~stratja
>
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2005-11-02

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Deparment of Sociology
Fudan University

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