[R] help with aggregate()

[Phil Spector]

Sam -
    Since the error message said the argument wasn't numeric
or logical, that would be the source of your problem.  What
is the result of

class(all$Value)

If it's 'character' or 'factor', that would explain the problem.
Provide more details for a (most likely) easy solution.

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Tue, 15 Feb 2011, Sam Steingold wrote:

>> * 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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