[R] R: Appending the files

[John Kane]

--- Vaibhav Gathibandhe
<gathibandhe.vaibhav at gmail.com> wrote:

> Hello R-Experts,
> 
> I am a beginner to R. Can someone please look at my
> problem
> 
> I am trying to append the files in R but couldn't
> get the answer properly.
> 
> My code is
> 
> mat1<-matrix(0,2,3)
> mat2<-matrix(1,2,3)
> 
> write.table(mat1,"foo.csv",sep=",",col.names=NA)
> write.table(mat2,"foo.csv", sep=",", col.names=NA,
> append = TRUE)
> 
> I am getting a warning message:
> 
> Warning message:
> appending column names to file in: write.table(mat2,
> "foo.csv", sep = ",",
> col.names = NA, append = TRUE)
> 
> Moreover the data of *mat2* is getting appended to
> "foo.csv" in the
> following way
> 
>        V1    V2     V3 1 0 0 0 2 0 0 0     V1    V2 
>    V3 1 1 1 1 2 1 1 1
> 
> If data is getting appended then why I am getting
> the warning message?

I'm a newbie too, but I think it is just a "warning". 
:)  I suspect it is just to tell you that you are
appending to a file and not creating a new file.  Iwas
a bit upset the first time I saw it until I realised
the write command was working just fine.

> 
> Moreover is there any way by which i can get the
> data of *mat2* beside the
> data of *mat1* instead of below?

I suspect that you would have to join the two matrices
together in R. 

cbind the two matrices xx <- cbind(mat1, mat2)  and
then save the resulting larger matrix X .  Will that
work?