[R] format: from list to data frame

[David Winsemius]

On Mar 13, 2010, at 11:46 AM, Javier wrote:

>
> Dear users,
>
> Is anyone out there on a Saturday to answer this easy question?
>
> I have the "yo" object data in a "list" format:
>
>> str(yo)
> num [1:259, 1:173] 16.3 NA NA NA NA ...
> - attr(*, "dimnames")=List of 2
>  ..$ x: chr [1:259] "367319" "367329" "367309" "367339" ...
>  ..$ y: chr [1:173] "780175" "780185" "780195" "780205" ...
>> length(yo)
> [1] 44807
>
> where x is the name of the rows and y the name of the columns  
> (coordinates)
> of a matrix of 44807 values
>
> how can I get a data.frame with these three columns: x, y, values

?as.data.frame.table

 > as.data.frame.table(matrix((1:16)/16, ncol=2))
    Var1 Var2   Freq
1     A    A 0.0625
2     B    A 0.1250
3     C    A 0.1875
4     D    A 0.2500
5     E    A 0.3125
6     F    A 0.3750
7     G    A 0.4375
8     H    A 0.5000
9     A    B 0.5625
10    B    B 0.6250
11    C    B 0.6875
12    D    B 0.7500
13    E    B 0.8125
14    F    B 0.8750
15    G    B 0.9375
16    H    B 1.0000


You will need to relabel the columns but the "names()<-" function will  
suffice.

--
David.

>
> Many thanks to the Saturday working people.
>
> Javier					
>
>
>
>
>
>
>
>
> and I want to produce a data frame
>
> -- 
> View this message in context: http://n4.nabble.com/format-from-list-to-data-frame-tp1591773p1591773.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
West Hartford, CT