Thanks Ted for the help. I will try and see if my case will get the expected
results.

Dong

On 7/30/07, Ted Harding <ted.harding@nessie.mcc.ac.uk> wrote:
>
> On 29-Jul-07 17:41:58, Dong GUO 郭东 wrote:
> > Hi,
> >
> > I want to save an array(say, array[6,7,8]) write a cvs file.
> > How can I do that??? can I write in one file?
> >
> > if I could not write in one file, i want to use a loop to save
> > in different files (in the array[6,7,8], should be 8 csv files),
> > such as the filename structure should be:
> > file ="filename" +str(i)+"." +"csv"
> >
> > Many thanks.
>
> The following (illustrated on a smaller array) may help:
>
> A<-array((1:60),dim=c(3,4,5))
> D<-dim(A)
>
> write.table(t(dim(A)),file="A.csv",sep=",",
>             quote=FALSE,row.names=FALSE,col.names=FALSE)
>
> Z<-as.vector(A)
> write.table(t(Z),file="A.csv",append=TRUE,sep=",",
>             quote=FALSE,row.names=FALSE,col.names=FALSE)
>
> Then the file A.csv contains two rows:
>
> 3,4,5
> 1,2,3,4,5,6,7,8,9,10,11,12, ... ,55,56,57,58,59,60
>
> of which the first gives the dimension, the second the
> data for the array.
>
> You can then reconstruct another array, say B, as:
>
> dimB<-scan(file="A.csv",sep=",",nlines=1)
> dataB<-scan(file="A.csv",sep=",",skip=1,nlines=1)
> B<-array(dataB,dimB)
>
> That's a hard way to do things, perhaps, but since you said
> you wanted the array as a CSV file, this is one way to do that.
>
> Since a CSV text file is essentially a two-dimensional object
> (fields in rows, by rows), to store a higher-dimensional object
> in such a format you have to include the "meta-data" about the
> structure -- in this case the list of dimensions.
>
> Note, however, that, although it is a CSV file,
>
> read.csv("A.csv",header=FALSE)
>
> will not work nicely, since it will give you two rows of equal
> length, the first one padded out with (in this case 57) NAs,
> which you will then have to clean up; which you can do, but by
> the time you've done it you might as well have done it the above
> way!
>
> Hoping this helps,
> Ted.
>
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> E-Mail: (Ted Harding) <ted.harding@nessie.mcc.ac.uk>
> Fax-to-email: +44 (0)870 094 0861
> Date: 30-Jul-07                                       Time: 22:24:12
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