[R] coerce (list) object to type 'double'
wendy
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
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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.
jim holtman
> 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
>
> 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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