your data *seems* to have an unusual decimal separator. That would  
explain why the two-step conversion to numeric fails, while the brute  
conversion to numeric always gives the factor integer codes.


I don't know where your data comes from (str() would be helpful in any  
case), but if you read it using read.table consider the dec=","  
argument.


connection <- textConnection(
	  "caedois           b1           b2           b3
        1       0,033120395 -20,29478338 -0,274638864
        2     -0,040629634  74,54239889 -0,069958424
        5    -0,001116816   35,2398622  0,214327185"
)

d <- read.table(connection, head=T, dec=",")

str(d)

subset(d, d$b1>0)
#  caedois       b1      b2       b3
# 1       1 0.033120 -20.295 -0.27464

HTH,

baptiste


On 1 Jun 2009, at 22:34, Cecilia Carmo wrote:

>
>
>
>
>
>   --- the forwarded message follows ---
>
> From: Cecilia Carmo <cecilia.carmo@ua.pt>
> Date: 1 June 2009 22:33:15 GMT+02:00
> To: "markleeds@verizon.net" <markleeds@verizon.net>
> Subject: Re: [R] subset dataframe/list
>
>
> Doesn´t work neither!
>
>> head(coeficientes)
>    caedois           b1           b2           b3
> 1        1       0,033120395 -20,29478338 -0,274638864
> 2        2     -0,040629634  74,54239889 -0,069958424
> 3        5    -0,001116816   35,2398622  0,214327185
> 4       10     0,171875
> 5       14    0,007288399  40,06560548 -0,081828338
> 6       15    0,027530346  0,969969409  0,102775555
>
> I’ve done
> coeficientes$b1<-as.numeric(as.character(coeficientes$b1))
> And b1 was substituted by NA’s
>
> Then I’ve done
> coeficientes$b1<-as.numeric(coeficientes$b1)
> And b1 was transformed in other numbers
>      caedois   b1           b2           b3
> 1        1    38    -20,29478338 -0,274638864
> 2        2     7     74,54239889 -0,069958424
> 3        5     2     35,2398622  0,214327185
> 4       10    48
> 5       14    15  40,06560548 -0,081828338
> 6       15    31  0,969969409  0,102775555
>
> Thanks anyway,
> Cecília
>
>
> Em Mon, 01 Jun 2009 13:11:48 -0500 (CDT)
>  markleeds@verizon.net escreveu:
>> hi: when I sent you my solution,  I didn't realize that
>> you had factors. if you change the
>> factors  to characters as described in that email, and
>> then use my approach , i think it should still work.
>>
>>
>>
>>
>>
>>
>> On Jun 1, 2009, markleeds@verizon.net wrote: Hi:
>>
>> coeficientes[,(coeficientes[,"b1"] > 0)]
>>
>> will i think give you all the rows of the object where
>> b1 is greater than zero.
>>
>> I can't tell if coeficients is a data frame or a matrix
>> but the above should work in either case.
>>
>>
>>
>>
>>
>> On Jun 1, 2009, Cecilia Carmo <cecilia.carmo@ua.pt>
>> wrote: Hi R-helpers!
>>
>> I have the following object:
>>> head(coeficientes)
>>    caedois           b1           b2           b3
>> 1       1    0,033120395 -20,29478338 -0,274638864
>> 2       2   -0,040629634  74,54239889 -0,069958424
>> 3       5   -0,001116816   35,2398622  0,214327185
>> 4      10     0,171875
>> 5      14   0,007288399  40,06560548 -0,081828338
>> 6      15   0,027530346  0,969969409  0,102775555
>>
>> I´ve tried to subset it like this:
>>> coefSelected<-subset(coeficientes,"b1">0)
>> but it does nothing
>>
>> Then Ive tried:
>>> coefSelected<-subset(coeficientes,b1>0)
>> But I´ve got the following
>> Warning message:
>> In Ops.factor(b1, 0) : > not meaningful for factors
>>
>> So Ive tried:
>>> coefSelected<-subset(coeficientes,coeficientes$b1>0)
>> Warning message:
>> In Ops.factor(coeficientes$b1, 0) : > not meaningful for
>> factors
>>
>> I´ve done
>>> mode(coeficientes)
>> [1] "list"
>>
>> But I don´t know how to handle it!
>> Coul anyone help me?
>> Thanks,
>>
>> Cecília Carmo (Universidade de Aveiro  Portugal
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained,
>> reproducible code.
>>
>
>
>
>
> <ATT00001.txt>

_____________________________

Baptiste Auguié

School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK

Phone: +44 1392 264187

http://newton.ex.ac.uk/research/emag
______________________________


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