R help - Jul 2009 - naming of columns in R dataframe consisting of mixed data (alphanumeric and numeric)

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





	[[alternative HTML version deleted]]

Mary A. Marion-2 wrote:
> 
> 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]
> 
You tried to give a name to a column that do not exist (the second one you
called "value"). You can check that using str(tresults2).
The name of the columns should not (well, I don't see how) interfere with
the type (or class) they contain.

You can create a Value column by using tresults2$Value <- your_value


> 
> Am I to use c( , ) or list( , ) with a dataframe?
> 
You picked the right one ( c() )... to give the names, I guess this is what
you were asking.

Cheers,
Etienne

> Thank you for your help.
> Sincerely,
> Mary A. Marion
> 
-- 
View this message in context:
http://www.nabble.com/naming-of-columns-in-R-dataframe-consisting-of-mixed-data-%28alphanumeric-and-numeric%29-tp24411614p24416676.html
Sent from the R help mailing list archive at Nabble.com.

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
> 
> 
> 
> 
> 
> ??? [[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org
> mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained,
> reproducible code.
>