[R] Length problem

[Benilton Carvalho]

if "data" was your data.frame, data[4:length(data)] was also a  
data.frame.

but, c(data[4:length(data)] ) coerces it to a list.

therefore coppie is a list.

coppie[1] is also a list of length 1...

compare that to: coppie[[1]]

b

On Feb 11, 2008, at 10:38 AM, milton ruser wrote:

> Ciao Paolo,
>
> How about you show some row of your data?
> How many columns have your data.frame? One?
> By the way "data" is not a so good name for your data frame.
>
> We will be very happy to help you
>
> Kindly,
>
> Miltinho
> Brasile
>
> On 2/11/08, Paolo Grillo <paolo.grillo at guest.unimi.it> wrote:
>>
>>
>>  Hi all
>>  I have this problem:
>>  In my database .dta, called "data" I have five rows
>>  data<-read.dta("C:\\2_CO_mmobile_ALL_Rid.dta")
>>  # From this database  I wuold like to create another
>>  coppie<-c(data[4:length(data)])
>>  but I find this
>>
>>  # Length of  original data
>>  length(data[,4])
>>  5                       RIGHT!!
>>  # Length of new data
>>  length(coppie[1])
>>  1                      WHY??
>>  Thank you all for your help
>>  Paolo Grillo
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>
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>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.