[R] Re :argument is not numeric or logical

[David Winsemius]

On May 2, 2010, at 9:39 AM, Mohan L wrote:

> Hi all,
>
> I have data size of :
>
>> dim(sample)
> [1] 35943    17

Your code has a different name for the sample object. And it would be  
more informative if you offered str on "sample1".

-- 
David.
>
> The first column is "stdate"  - is date  ( 01/11/2009  
> 00:00:00,02/11/2009
> 00:00:00,02/11/2009 00:00:00 etc... )
> Login is 13th column - is numbers (12,0,1 erc...)
>
> The below operation return the following error.
>
>> sample1 <- read.csv(file="sample1.csv",sep=",",header=TRUE)
>> avglog <- with(sample1, tapply(Login, stdate, mean))
>
> 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
> 6: In mean.default(X[[6L]], ...) :
>  argument is not numeric or logical: returning NA
> 7: In mean.default(X[[7L]], ...) :
>  argument is not numeric or logical: returning NA
>
>
>> avglog
> 01/11/09 00:00 02/11/09 00:00 03/11/09 00:00 04/11/09 00:00 05/11/09  
> 00:00
>            NA             NA             NA              
> NA             NA
>
> How to fix this issue?
>
> Thanks & Rg
> Mohan L
>
> 	[[alternative HTML version deleted]]
>
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David Winsemius, MD
West Hartford, CT