[R] naming of columns in R dataframe consisting of mixed data (alphanumeric and numeric)

[Moshe Olshansky]

Hi Mary,

Your data.frame has just one column (not 2)! You can check this by dim(tresult2).
What appears to you to be the first column (names) are indeed rownames.
If you really want to have two columns do something like 
tresult2 <- cbind(colnames(tresult),data.frame(t(tresult),row.names=NULL))
Now tresult2 contains 2 columns and you can proceed with  
names(tresults2)<-c("Statistic ", "Value")

--- On Fri, 10/7/09, Mary A. Marion <mmstat at comcast.net> wrote:

> From: Mary A. Marion <mmstat at comcast.net>
> Subject: [R] naming of columns in R dataframe consisting of mixed data (alphanumeric and numeric)
> To: r-help at r-project.org
> Received: Friday, 10 July, 2009, 3:50 AM
> Hello,
> 
> I have an r function that creates the following dataframe
> tresults2.
> Notice that column 1 does not have a column heading.
> 
> Tresults2:
>              
>    [,1]
> estparam     18.00000
> nullval      20.00000
> . . .
> ciWidth       2.04622
> HalfInterval  1.02311
> 
> pertinent code:
> results<-cbind( estparam, nullval, t, pv_left, pv_right,
> pv_two_t, 
> estse, df,  cc, tbox, llim, ulim, ciWidth,
> HalfInterval)
> tresults<-round((results),5)
> tresults2<-data.frame(t(tresults))
> names(tresults2)<-c("Statistic ", "Value")
> tresults2
> 
> ===========================================================================================
> After transposing my dataframe tresults2 consists of 2
> columns.  
> Col1=alphanumeric data (this really is a variable name)
> and
> col2=numeric data (this is value of varaiable).
> 
> how do I name columns when columns are different
> (alphanumeric and numeric)
> to avoid the following error:
> 
> Error in names(tresults2) <- c("Statistic ", "Value") :
>   'names' attribute [2] must be the same length as the
> vector [1]
> 
> Am I to use c( , ) or list( , ) with a dataframe?
> 
> Thank you for your help.
> Sincerely,
> Mary A. Marion
> 
> 
> 
> 
> 
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