R help - Sep 2010 - Question on levels function and extracting the associated level number

>
> Dear Sir/Madam,
>
> I have a quick question, which I hope someone can help.
>
> I am using the levels function in R, which helps to summarize the number of
> factors that I have in a vector in an ordered manner.
>
> Using an already existing example:
>
> > state <- c("tas", "sa",  "qld",
"nsw", "nsw", "nt",  "wa", 
"wa",
>                   "qld", "vic", "nsw",
"vic", "qld", "qld", "sa", 
"tas",
>                   "sa",  "nt",  "wa", 
"vic", "qld", "nsw", "nsw",
"wa",
>                   "sa",  "act", "nsw",
"vic", "vic", "act")
>
> > statef <- factor(state)
>
> > levels(statef)
>
>      [1] "act" "nsw" "nt"  "qld"
"sa"  "tas" "vic" "wa"
>
>
> I will now like to go through the entire vector "state", and
generate the
> corresponding level. Using the example, there are 8 levels, and so I will
> like to generate the corresponding vector (6, 5, 4, 2, 2, 3, .......1)
which
> is the "level number" corresponding to the vector
"state".
>
> Any guidance/assistance will be much appreciated. Thank you so much!!
>
> sincerely,
> Jeff
>
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Jeffrey,

You can try
> as.numeric(state)
 [1] 6 5 4 2 2 3 8 8 4 7 2 7 4 4 5 6 5 3 8 7 4 2 2 8 5 1 2 7 7 1

HTH,
Jorge


On Sat, Sep 25, 2010 at 5:51 PM, Jeffrey Cexun Cai <> wrote:
> >
> > Dear Sir/Madam,
> >
> > I have a quick question, which I hope someone can help.
> >
> > I am using the levels function in R, which helps to summarize the
number
> of
> > factors that I have in a vector in an ordered manner.
> >
> > Using an already existing example:
> >
> > > state <- c("tas", "sa",  "qld",
"nsw", "nsw", "nt",  "wa", 
"wa",
> >                   "qld", "vic", "nsw",
"vic", "qld", "qld", "sa", 
"tas",
> >                   "sa",  "nt",  "wa", 
"vic", "qld", "nsw", "nsw",
"wa",
> >                   "sa",  "act", "nsw",
"vic", "vic", "act")
> >
> > > statef <- factor(state)
> >
> > > levels(statef)
> >
> >      [1] "act" "nsw" "nt" 
"qld" "sa"  "tas" "vic" "wa"
> >
> >
> > I will now like to go through the entire vector "state", and
generate the
> > corresponding level. Using the example, there are 8 levels, and so I
will
> > like to generate the corresponding vector (6, 5, 4, 2, 2, 3, .......1)
> which
> > is the "level number" corresponding to the vector
"state".
> >
> > Any guidance/assistance will be much appreciated. Thank you so much!!
> >
> > sincerely,
> > Jeff
> >
>
>        [[alternative HTML version deleted]]
>
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