Re: [R] name ONLY one column

[Pedersen Jon]

Hi,
It is because the column names do not exist. If you cast the matrix as a
data frame your code would work.
jon

-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
On Behalf Of Lorenzo Cattarino
Sent: 27. september 2010 10:27
To: r-help@r-project.org
Subject: [R] name ONLY one column

Hi R-users

 

I can not change the name of one column only of my matrix.

 

my_matrix - matrix (1:12,ncol=3)

 

colnames(my_matrix)[1] - 'myname'

 

Error in dimnames(x) - dn : 

  length of 'dimnames' [2] not equal to array extent

 

thank you for your help

 

Lorenzo


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Re: [R] Adding row name to dataframe

[Pedersen Jon]

Tim,
The row names have only one dimension,  so for example
row.names(xy)[11]-New rname
will work
best,
Jon

-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On 
Behalf Of Tim Clark
Sent: 27. september 2010 04:41
To: r-help@r-project.org
Cc: tim_cl...@nps.gov
Subject: [R] Adding row name to dataframe

Dear all,

I am trying to add a value to a dataframe and name the row with a number.  I 
have tried row.name, rowname, and attr(x,row.names) but none seem to work.  
It 
seems like it should be simple, so not sure why I can't get it to work.  Any 
suggestions?

Thanks,

Tim



x-seq(1,20,2)
y-seq(20,1,-2)
xy-data.frame(x,y)
xy-rbind(xy,c(0,0))

#Threeattempts that fail
row.names(xy[11,])-c(12)
rownames(xy[11,])-c(12)
attr(xy[11,], row.names)-c(12)


 Tim Clark

Marine Ecologist
National Park of American Samoa




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