I assume that what you want is a matrix from the dataframe that was read in:
> x <- read.table(textConnection("1 2 3
+ 4 5 6
+ 7 8 9"))
>
> x
V1 V2 V3
1 1 2 3
2 4 5 6
3 7 8 9
> str(x)
'data.frame': 3 obs. of 3 variables:
$ V1: int 1 4 7
$ V2: int 2 5 8
$ V3: int 3 6 9
> x.n <- as.numeric(x) # not the way to do it
Error: (list) object cannot be coerced to type 'double'
No suitable frames for recover()
> x.n <- as.matrix(x) # convert dataframe to matrix
> str(x.n)
int [1:3, 1:3] 1 4 7 2 5 8 3 6 9
- attr(*, "dimnames")=List of 2
..$ : NULL
..$ : chr [1:3] "V1" "V2" "V3"
> x.n
V1 V2 V3
[1,] 1 2 3
[2,] 4 5 6
[3,] 7 8 9
>
On Sat, Feb 20, 2010 at 12:50 PM, wendy <wendy.q...@utoronto.ca> wrote:
>
> Dear all,
>
> I am really new to R, and I have problem here. I searched around, but did
> not get a solution.
>
> I have a numetrix matrix (20 by 25) saved in .csv. I read it as
>
> >sx<-read.csv("sx.csv",header=F)
> Then I try to convert it to numeric using
>
> >sx<-as.numeric(sx)
> Error: (list) object cannot be coerced to type 'double'
> The class of sx is "data.frame".
>
> I tried to unlist it as,
> s<-unlist(sx), but when I look at the dimension,
> > dim(s)
> NULL
>
> Can anyone tell me how should I load my data as a numeric matrix rather
> than
> "data.frame", or how to convert the data.frame matrix into numeric?
>
> Thank you very much.
> Wendy
> --
> View this message in context:
> http://n4.nabble.com/coerce-list-object-to-type-double-tp1562988p1562988.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<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?
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