[R] Working with lists with numerical names

From: Christopher Swingley <cswingle_at_iarc.uaf.edu>
Date: Fri 24 Feb 2006 - 10:10:29 EST


Greetings!

I'm have a hard time working with some data I imported from a baseball database. Several of the database columns have numbers in them (2B, 3B), and when I try to use these vectors from the data frame, I get syntax errors, probably because it's interpreting the name as a number:

> show(batting2005)

   playerID yearID stint teamID lgID G AB R H 2B 3B HR RBI SB CS BB

   1   robleos01   2005     1    LAN   NL 110 364  44  99 18  1  5 34  0  8  31
   2   iguchta01   2005     1    CHA   AL 135 511  74 142 25  6 15 71 15  5  47
   3   molinya01   2005     1    SLN   NL 114 385  36  97 15  1  8 49  2  3  23
   . . .
> print(batting2005$HR)

   [1] 5 15 8 3 14 3 6 21 8 7 9 27 12 5 14 8 28 9 22 15 5    22 9 10 1
   . . .
> print(batting2005$2B)

 Error: syntax error in "print(batting2005$2"

> SLG<-(H + 2B + 3B * 2 + HR * 3) / AB;
 Error: syntax error in "SLG<-(H + 2B" # batting2005 is attached

> SLG<-(H + "2B" + "3B" * 2 + HR * 3) / AB;
 Error in H + "2B" : non-numeric argument to binary operator

Is there a way to "escape" the '2B' somehow or encapsulate it so that R knows I'm talking about that particular numeric vector?

Thanks,

Chris

-- 
Christopher S. Swingley          email: cswingle@iarc.uaf.edu
Intl. Arctic Research Center
University of Alaska Fairbanks   www.frontier.iarc.uaf.edu/~cswingle/

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Received on Fri Feb 24 10:24:23 2006

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