[R] Taking mean of 3 cols in data frame : error

[Abhishek Pratap]

I see what is happening here. When I am reading the data frame values
from a csv file, they are not read as numerics.

_A

On Sat, Jan 30, 2010 at 12:29 AM, Abhishek Pratap
<abhishek.vit at gmail.com> wrote:
> Hi All
>
> I am seeing quite a silly thing for which I dont have much of
> explanation. I want to take per row mean of 3 columns of a data frame.
>  What I am getting is  all NA in the result. Here is what I am doing
>
>
> apply(a[,1:3],1,mean)
>
> I get warnings.
>
>  In mean.default(newX[, i], ...) :
>  argument is not numeric or logical: returning NA
>
> I am not sure how it thinks the values are not numeric. May be I had a
> long day and not able get something fairly obvious.
>
> ==========
> summary(a)
>
>  animal1_wt             animal2_wt                              animal3_wt
>  0         : 5448          0         : 5295               0         :
> 5501
>  0.232266  :    7          0.17356   :    5           6.22424   :    6
>  1.05487   :    6          0.00630758:    4           0.0395818 :    5
>  0.258336  :    5          0.0131442 :    4           4.14949   :    5
>  0.372308  :    5          0.0143924 :    4           0.00964998:    4
>  0.00926343:    4          0.017208  :    4           0.0172297 :    4
>  (Other)   :15696          (Other)   :15855           (Other)   :15646
>