[R] help with aggregate()

[Sam Steingold]

> * Sam Steingold <fqf at tah.bet> [2011-02-14 18:42:40 -0500]:
>
> byFOO$Mean <- aggregate(all$Value, by = list(all$FOO), FUN = mean)$x;

this fails with

There were 50 or more warnings (use warnings() to see the first 50)
> warnings()
Warning messages:
1: In mean.default(X[[1L]], ...) :
  argument is not numeric or logical: returning NA
2: In mean.default(X[[2L]], ...) :
  argument is not numeric or logical: returning NA
3: In mean.default(X[[3L]], ...) :
  argument is not numeric or logical: returning NA
4: In mean.default(X[[4L]], ...) :
  argument is not numeric or logical: returning NA
5: In mean.default(X[[5L]], ...) :
  argument is not numeric or logical: returning NA

note that there are absolutely no NAs in all$Value:
> all(!is.na(all$Value))
[1] TRUE

-- 
Sam Steingold (http://sds.podval.org/) on CentOS release 5.3 (Final)
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((lambda (x) `(,x ',x)) '(lambda (x) `(,x ',x)))