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
Try this:
unname(as.matrix(read.table('your_file.txt')))
On Wed, Apr 22, 2009 at 11:00 AM, tsunhin wong <thjwong@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
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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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 <thjwong at 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
You need to convert to a matrix and remove names:> x <- read.table(textConnection("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"), header=TRUE)> closeAllConnections() > y <- as.matrix(x) > xM1 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> yM1 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> dimnames(y) <- NULL > y[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [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>On Wed, Apr 22, 2009 at 10:00 AM, tsunhin wong <thjwong at 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 > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve?
Hi, I have the same problem as Wong. I have a csv file that contains weather observation (rows) by days (in columns). I open using:> temp = read.csv("Weather.csv", sep=",")and read: X X1.Jan X2.Jan X3.Jan X4.Jan 1 Min 2 3 4 1 2 Max 6 10 8 6 3 Forecast Min 3 1 1 3 4 Forecast Max 8 7 4 9 If I type mean(temp[2,2:3]) I get X1.Jan X2.Jan 6 10 The same command on> y = matrix(1:21, ncol=7)> mean(y[2,2:3])[1] 6.5 works because the data is in a matrix. So how do I convert the data from my csv file into a matrix? I tried as.matrix but it did not help. Many many thanks! -- View this message in context: http://r.789695.n4.nabble.com/read-table-or-read-csv-without-row-index-tp883594p2131537.html Sent from the R help mailing list archive at Nabble.com.
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