Really, this depends on what you are trying to do. What's the underlying
problem you are solving? You can save a data frame to a file without
the names, if that's the real question, but I can't think of any reason to
not want names within R.
A matrix does not have to have row and column names, but a dataframe
is required to have them. If none are specified, sequential values will be
assigned.
> matrix(1:9, 3, 3)
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
> data.frame(matrix(1:9, 3, 3))
X1 X2 X3
1 1 4 7
2 2 5 8
3 3 6 9
Sarah
On Wed, Apr 22, 2009 at 10:00 AM, tsunhin wong <thjw...@gmail.com> wrote:
> Hello all,
>
> Probably my concepts about the data.frame and matrix and array in R
> are not clear, I need some clarification to help me understand them
> better.
>
>>M <- read.table("test1.csv",sep=",",row.names=NULL,header=T)
>
> gives me: M as
>
> M1 M2 M3 M4 M5 M6 M7 M8 M9 M10
> 1 9 11 14 15 18 20 20 20 20 20
> 2 3 4 8 9 11 12 14 15 15 15
> 3 4 5 8 8 9 9 9 9 9 9
> 4 4 5 7 8 8 8 8 8 8 9
>
> 1. How can I read the csv file to:
>
> M1 M2 M3 M4 M5 M6 M7 M8 M9 M10
> [1,] 9 11 14 15 18 20 20 20 20 20
> [2,] 3 4 8 9 11 12 14 15 15 15
> [3,] 4 5 8 8 9 9 9 9 9 9
> [4,] 4 5 7 8 8 8 8 8 8 9
>
> 2. or how can convert the above M to a format with [1,],[2,] etc
> instead of 1,2,etc?
>
> 3. How can I read a text file so that I can get:
> [,1] [,2] [,3] [,4] [,5]
> [1,] 9 11 14 15 18
> [2,] 3 4 8 9 11
> [3,] 4 5 8 8 9
> [4,] 4 5 7 8 8
>
> (instead of having the columns names V1 to V5?)
>
> Thank you for your help!
>
> Regards,
>
> John
>
--
Sarah Goslee
http://www.functionaldiversity.org
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