> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
> On Behalf Of Vincy Pyne
> Sent: Thursday, December 30, 2010 10:07 PM
> To: r-help@r-project.org
> Subject: [R] Changing column names
>
> Dear R helpers
>
> Wish you all a very Happy and Prosperous New Year 2011.
>
> I have following query.
>
> country = c("US", "France", "UK", "NewZealand", "Germany", "Austria",
> "Italy", "Canada")
>
> Through some other R process, the result.csv file is generated as
>
> result.csv
>
> var1 var2 var3 var4 var5 var6 var7 var8
> 1 25 45 29 92 108 105 65 56
> 2 80 132 83 38 38 11 47 74
> 3 135 11 74 56 74 74 74 29
>
>
> I need the country names to be column heads i.e. I need an output like
>
> > result_new
> US France UK NewZealand Germany Austria Italy
> Canada
> 1 25 45 29 92 108
> 105 65 56
> 2 80 132 83 38 38
> 11 47 74
> 3 135 11 74 56 74
> 74 74 29
>
>
> The number of countries i.e. length(country) matches with total number of
> variables (i.e. no of columns in 'result.csv').
>
> One way of doing this is to use country names as column names while
> writing the 'result.csv' file.
>
> write.csv(data.frame(US = ..........., France = .......), 'result.csv',
> row.names = FALSE)
>
>
> However, the problem is I don't know in what order the country names will
> appear and also there could be addition or deletion of some country names.
> Also, if there are say 150 country names, the above way (i.e. writing.csv)
> of defining the column names is not practical.
>
> Basically I want to change the column heads after the 'result.csv' is
> generated.
>
> Kindly guide.
>
> Regards
>
> Vincy
>
>
The posting guide asks for a self-contained, reproducible example. This is a
case where it seems this would be mandatory. First,
country = c("US", "France", "UK", "NewZealand", "Germany", "Austria", "Italy",
"Canada")
is not a query. We don't know how you are using this vector, and you tell us
that the order in which the variables are returned may change, but give us no
clue as to how they might change. So there is no possible way anyone can give
you any assistance without further information. Give us a sample data frame
with a few columns and few rows and show how you are generating your results,
and I am sure someone will be able to help you out. But you have to help us.
:-)
Dan
Daniel Nordlund
Bothell, WA USA
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