R help - Nov 2009 - how can I convert .csv format to matrix???

In my disk C:/ have a  a.csv file, I want to read it  to R, importantly, when
I use x=read.csv("C:/a.csv") ,the x format  is  data.frame,  I want to
it to
become matrix format,  how can I do it ?

thank you! 
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can try

 matrix.x <- as.matrix(x)

On Mon, Nov 2, 2009 at 8:38 PM, bbslover <dluthm@yeah.net> wrote:
>
> In my disk C:/ have a  a.csv file, I want to read it  to R, importantly,
> when
> I use x=read.csv("C:/a.csv") ,the x format  is  data.frame,  I
want to it
> to
> become matrix format,  how can I do it ?
>
> thank you!
> --
> View this message in context:
>
http://old.nabble.com/how-can-I-convert-.csv-format-to-matrix----tp26156643p26156643.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]

bbslover wrote:
> 
> In my disk C:/ have a  a.csv file, I want to read it  to R, importantly,
> when I use x=read.csv("C:/a.csv") ,the x format  is  data.frame, 
I want
> to it to become matrix format,  how can I do it ?
> 
as.matrix should do the job; if it does not (second example), you probably
have rownames or some other string in your data set.

Dieter

# use read.csv instead
x = data.frame(a=1:10,b=11:20)
xm = as.matrix(x)
str(xm)
xm # looks good

x1 = data.frame(a=1:10,b=11:20,c=letters[1:10])
xm1 = as.matrix(x1)
str(xm1)
xm1 # looks strange, because it's all strings


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thank you for your help,it is a good way.


Steven Kang wrote:
> 
> can try
> 
>  matrix.x <- as.matrix(x)
> 
> On Mon, Nov 2, 2009 at 8:38 PM, bbslover <dluthm at yeah.net> wrote:
> 
>>
>> In my disk C:/ have a  a.csv file, I want to read it  to R,
importantly,
>> when
>> I use x=read.csv("C:/a.csv") ,the x format  is  data.frame, 
I want to it
>> to
>> become matrix format,  how can I do it ?
>>
>> thank you!
>> --
>> View this message in context:
>>
http://old.nabble.com/how-can-I-convert-.csv-format-to-matrix----tp26156643p26156643.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
>> 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<http://www.r-project.org/posting-guide.html>
>> and provide commented, minimal, self-contained, reproducible code.
>>
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> 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.
> 
> 
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