[R] Stucked with as.numeric function

[David Winsemius]

On Mar 21, 2011, at 2:59 PM, Tóth Dénes wrote:

>
> Hi,
>
> I guess you have commas as decimals in your data. Replace it to  
> decimal
> points.

If that is true then the easiest fix would be to set the proper  
decimal argument in read.table

?read.table  # with ... , dec = "," ,

-- 
david.



>
> Best,
>  Denes
>
>
>>
>> On Mar 21, 2011, at 1:57 PM, patsko at gmx.de wrote:
>>
>>> Hi list,
>>>
>>> I have problems with the as.numeric function. I have imported
>>> probabilities from external data, but they are classified as factors
>>> as str() shows. Therefore my goal is to convert the colum from
>>> factor to numeric level with keeping the decimals.
>>>
>>> I have googled the problem for a while now and kept to several
>>> advices like
>>> http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-do-I-convert-factors-to-numeric_003f
>>> and history from the list but it is impossible for me to convert
>>> the data to numeric without rounding or ranking the values.
>>
>> Are you sure about rounding? The console display of numbers is
>> determined by options that can be changed:
>>
>> ?options
>>
>> The "ranking" may represent an error on your part. You offer nothing
>> that can be used to check your interpretations. Why not offer:
>>
>> dput(head(data_object))
>>
>>
>>>
>>> E.g.:
>>> Simply using as.numeric puts the values into ranked classes as
>>> explained in the manual,
>>> As.numeric(as.character(probas)) as well as as.numeric(levels(probas
>>> $forecast_probs))[as.integer(probas$forecast_probs)]
>>> return “NA” for every row.
>>
>> Then maybe they were NA to begin with?
>>
>> Have you tried importing with colClasses set to "numeric" for the
>> columns you knew to be such?
>>>
>>
>> --
>>
>> David Winsemius, MD
>> Heritage Laboratories
>> West Hartford, CT
>>
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>>
>
>

David Winsemius, MD
Heritage Laboratories
West Hartford, CT