[R] write output in a custom format

[baptiste Auguié]

Hi,


I need to create a text file in the following format,

> 1 100.0 0
>  0 0
>  1 1
>  0 0
>  1 1
> #
> 1 100.0 0
>  0 0
>  0 1
>  1 0
>  1 1
...

where # is part of the format and not a R comment.

Each block (delimited by #) consists of a first line with three  
values, call it dose, and a list of (x,y) coordinates which are a  
matrix or data.frame,


> particle <- list(dose=c(1,100.0,0),pos=data.frame(x=c(0,1,0,1),y=c 
> (0,1,0,1)))
>
> print(particle)



I'd like to establish a connection to a file and append to it a  
"particle" block in the format above, or even write the whole file at  
once.

Because different lines have a different number of elements, I  
couldn't get write.table to work in this case, and my attempts at sink 
(), dump(), writeLines(), writeChar() all turn into really dirty  
solutions. I have this feeling I'm overlooking a simple solution.

Any help welcome,


baptiste

_____________________________

Baptiste Auguié

Physics Department
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK

Phone: +44 1392 264187

http://newton.ex.ac.uk/research/emag
http://projects.ex.ac.uk/atto