Dear Cecilia,
I have followed the replies you got and I found that, perhaps, what you are
experiencing has something to do with the decimal symbol in your data.

Consider the following:

# Reading the data as you sent it to the list
x <- read.table(textConnection("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"), header=TRUE, fill=TRUE)
closeAllConnections()

x$b1      # shows up as a factor
as.numeric(as.character(x$b1))   # NA!

Now, let's change the decimal symbol reading the data again BUT changing the
name from "x" to "y":

# Changing the decimal symbol
y <- read.table(textConnection("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"), header=TRUE, fill=TRUE,
dec=",")   # Here is the difference!
closeAllConnections()

y$b1       # it show up as numeric! :-)

and with "y", here is what you asked early this afternoon:

subset(y, b1>0)


Now, from the data you have, a workaround would be

x[,2:4] <- apply(x[,-1], 2, function(x) gsub(',','.', x) )
subset(x, b1>0)

See ?gsub, ?read.table and ?subset for more information.

HTH,

Jorge


On Mon, Jun 1, 2009 at 1:01 PM, 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 I’ve tried:
>
>> coefSelected<-subset(coeficientes,b1>0)
>>
> But I´ve got the following
> Warning message:
> In Ops.factor(b1, 0) : > not meaningful for factors
>
> So I’ve 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
>
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>

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