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$b1 # it show up as numeric! :-)
and with "y", here is what you asked early this afternoon:
subset(y, b1>0)
Now, from the data you have, a workaround would be
x[,2:4] <- apply(x[,-1], 2, function(x) gsub(',','.', x) )
subset(x, b1>0)
See ?gsub, ?read.table and ?subset for more information.
HTH,
Jorge
On Mon, Jun 1, 2009 at 1:01 PM, Cecilia Carmo <cecilia.ca...@ua.pt> wrote:
> Hi R-helpers!
>
> I have the following object:
>
>> head(coeficientes)
>>
> caedois b1 b2 b3
> 1 1 0,033120395 -20,29478338 -0,274638864
> 2 2 -0,040629634 74,54239889 -0,069958424
> 3 5 -0,001116816 35,2398622 0,214327185
> 4 10 0,171875
> 5 14 0,007288399 40,06560548 -0,081828338
> 6 15 0,027530346 0,969969409 0,102775555
>
> I´ve tried to subset it like this:
>
>> coefSelected<-subset(coeficientes,"b1">0)
>>
> but it does nothing
>
> Then Ive tried:
>
>> coefSelected<-subset(coeficientes,b1>0)
>>
> But I´ve got the following
> Warning message:
> In Ops.factor(b1, 0) : > not meaningful for factors
>
> So Ive tried:
>
>> coefSelected<-subset(coeficientes,coeficientes$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
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
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>
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