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

[Abhishek Pratap]

I exactly know my problem. The read.table by default reads my data
from few columns as factors/character type.  Can you please give me an
example of how to force it to read these columns as numbers. I dont
see example of how to use (as.is)

Thanks!
-Abhi

On Sat, Jan 30, 2010 at 12:34 AM, Abhishek Pratap
<abhishek.vit at gmail.com> wrote:
> 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
>>
>