[R] Setting the names of a data.frame

[Santosh Srinivas]

Thanks. 

Actually the sHeaders was a line in tData itself ...
I just did sHeaders = tData [1,]

How can I can build it without factors like your first suggestions?

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Ivan Calandra
Sent: 02 November 2010 20:22
To: r-help at r-project.org
Subject: Re: [R] Setting the names of a data.frame

Hi,

The problem is that all your columns of sHeaders are factors. It might 
be better to set stringsAsFactors to FALSE when you build it.

Or you can do it with a for loop like this:
for (i in 1:length(sHeaders)){
  names(tData)[i] <- as.character(sHeaders[1,i])
}

Or with lapply:
names(tData) <- unlist(lapply(sHeaders[1, ], FUN=as.character))

HTH,
Ivan

Le 11/2/2010 14:58, Santosh Srinivas a écrit :
> I have tData as below. I need to set the names with the headers from the
> first row in sHeaders
> Sorry .. forgot how to set the names from row in another data frame .. pls
> advise.
>
> names(tData) = sHeaders[1,] does not work correctly
>
> Also, why doesn't drop.levels(sHeaders) not work?
>
> dput(tData)
> structure(list(V1 = structure(c(3L, 1L, 1L, 2L), .Label = c("P H Ravi
> Kumar",
> "Rahul Kumar Singh", "Ramu GSV"), class = "factor"), V2 = structure(c(1L,
> 3L, 3L, 2L), .Label = c("05/10/2010", "09/09/2010", "30/09/2010"
> ), class = "factor"), V3 = structure(c(2L, 1L, 1L, 2L), .Label = c("B",
> "S"), class = "factor"), V4 = structure(c(2L, 3L, 3L, 1L), .Label =
> c("2120",
> "4000", "11000"), class = "factor"), V5 = structure(c(1L, 2L,
> 2L, 1L), .Label = c("", "0.01"), class = "factor"), V6 = structure(c(2L,
> 3L, 3L, 1L), .Label = c("765", "1000", "11000"), class = "factor"),
>      V7 = structure(c(1L, 2L, 2L, 1L), .Label = c("", "0.01"), class =
> "factor")), .Names = c("V1",
> "V2", "V3", "V4", "V5", "V6", "V7"), row.names = 5:8, class =
"data.frame")
>
>
> dput(sHeaders)
> structure(list(V1 = structure(1L, .Label = c("Name of Acquirer / Seller",
> "Qty", "Ramu GSV"), class = "factor"), V2 = structure(3L, .Label =
> c("05/10/2010",
> "%", "Transaction Date"), class = "factor"), V3 = structure(1L, .Label =
> c("Buy /Sale",
> "Qty", "S"), class = "factor"), V4 = structure(3L, .Label = c("4000",
> "%", "No.of Shares Transacted"), class = "factor"), V5 = structure(2L,
> .Label = c("",
> "Holding after Transaction"), class = "factor"), V6 =
structure(NA_integer_,
> .Label = "1000", class = "factor"),
>      V7 = structure(NA_integer_, .Label = "", class = "factor")), .Names =
> c("V1",
> "V2", "V3", "V4", "V5", "V6", "V7"), row.names = 3L, class = "data.frame")
>
>
> Thanks very  much.
>
> ______________________________________________
> R-help at r-project.org mailing list
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
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>

-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

**********
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