[R] Converting matrices into row vectors and saving as ASCII text

[David Winsemius]

XYT <- array(1:150, dim=c(3,5,10))
XYbyT= matrix(apply(XYT, 3, I), ncol=10)

...or even...

XYbyT= matrix(XYT, ncol=10)

--  
David.

On Sep 19, 2009, at 1:11 PM, Xi Ang wrote:

>
> Hi
>
> I have some data with these dimensions:
> 5 3 100
>
> which correspond to the x, y, and time dimensions, for a variable, p.
>
> I need the data in this format: 100 rows (1 row per time unit), and 15
> values in each row.
>
> I have attempted to reshape my data
>
>> dim(data)
> 5 3 100
>
>> attr(data,'dim')<-c(dim(data)[3],dim(data)[1]*dimdata[2])
>
> So I get data with 100 rows, 15 columns.
>
> I need to use this data outside of R, and so have to save it as an  
> ASCII
> file that retains the row-column structure of the data, but I do not  
> know
> how to.
>
> It would be ideal if I could end up with a text file that also has an
> additional column that labels which time unit (1-100) the row  
> belongs to,
> i.e.
>
> 1   a1,1  a1,2 ........... a1,15
> 2   a2,1  a2,2 ........... a2,15
> 3   a3,1  a3,2 ........... a3,15
> 4   a4,1  a4,2 ........... a4,15
> .
> .
> .
> 99
> 100
>
> Any suggestions would be appreciated.
>
> Thanks
> Xi
>
>
> -- 
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>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT