R help - Feb 2006 - strange question...

Hello,

 

I think this is Sill question but it's happens......

 

 

am$e_isell <- factor( with( am, ifelse( e_iacc == 1 & C5 == 1, 1, 0)))

 

summary (am$e_isell)

   0    1 

3966  296

(:-))

 

am$e_isell [4256]

[1] 1

Levels: 0 1

(:-))

 

cbind( am$e_isell[4256], am$C6[4256])

     [,1] [,2]

[1,] "2"  "1"

 

(????????????? :(  )

 

Does anyone understand why this happens?

 

 

Atenciosamente

Ana Patricia Martins

-------------------------------------------

Serviço Métodos Estatísticos

Departamento de Metodologia Estatística

Telef:  218 426 100 - Ext: 3210

E-mail:  <mailto:ana.pmartins@ine.pt> ana.pmartins@ine.pt

 


	[[alternative HTML version deleted]]

On  1 Feb 2006, ana.pmartins at ine.pt wrote:
> am$e_isell <- factor( with( am, ifelse( e_iacc == 1 & C5 == 1, 1,
> 0)))
>
>
> cbind( am$e_isell[4256], am$C6[4256])
>
> [,1] [,2]
>
> [1,] "2"  "1"
>
>
>
> (????????????? :(  )
>
>
>
> Does anyone understand why this happens?
A factor is an integer vector with levels.  Although there are many
operations one can perform on a factor that will "work" because of
automagic convertion of the factor to its underlying integer vector,
it is rarely useful, IMHO.

The following may help you see what is going on:

f = factor(c(0, 1, 1, 0))

unclass(f)

as.numeric(f)
as.integer(f)

as.character(f)
as.integer(as.character(f))

+ seth