[R] combining data structures

[Pete Brecknock]

David

1. The last line of the code should have been ...

Output = as.data.frame(do.call(rbind,nn))

# Output
  Node Connect.up Connect.down
1    1       NULL         2, 3
2    2          1         4, 5
3    3       NULL         2, 3
4    4          1         4, 5

Apologies for any confusion

2.  I am not familiar with the diagram package or the examples you describe.

Why the desire to create a data frame? Why not just use a list?

HTH

Pete


dkStevens wrote
> 
> Thanks for the reply. Two things - I must have something missing because 
> copying and pasting your example gave me an error
> 
> ... your definitions of nn
> 
>   Output = do.call(as.data.frame(rbind),nn)
> 
> Error in as.data.frame.default(rbind) :
>    cannot coerce class '"function"' into a data.frame
> 
> The second is the need, and why I'm not sure this is the best way. This 
> is to customize the flow charting library code from the library 
> 'diagram' to use a node-and-link characterization of a network - think 
> PERT charts or perhaps linking river segments in a water quality model. 
> Each Node will be a, say, circle and has attributes of being connected 
> up to one or more upstream nodes and down to one or more downstream 
> nodes. So the Connect.up column is a vector up upstream connections, 
> usually one but sometimes > one, and likewise Connect.down. There is an 
> accompanying table of links with attributes of which nodes are at each 
> end of a link and other metadata that describe the link (e.g. the length 
> of time required to traverse the link, its name etc. That said, my 
> thought was that the situation was too simple to fire up a full-blown 
> object system beyond what R provides natively. I guess it's like making 
> a data frame that has some 3-d elements.
> 
> 
> 
> On 2/3/2012 9:32 PM, Pete Brecknock wrote:
>> nn=list()
>>
>> nn[[1]] =  list(Node = "1", Connect.up = c(NULL), Connect.down = c(2,3))
>> nn[[2]] =  list(Node = "2", Connect.up = c(1), Connect.down = c(4,5))
>> nn[[3]] =  list(Node = "3", Connect.up = c(NULL), Connect.down = c(2,3))
>> nn[[4]] =  list(Node = "4", Connect.up = c(1), Connect.down = c(4,5))
>>
>> Output = do.call(as.data.frame(rbind),nn)
> 
> -- 
> David K Stevens, P.E., Ph.D., Professor
> Civil and Environmental Engineering
> Utah Water Research Laboratory
> 8200 Old Main Hill
> Logan, UT  84322-8200
> 435 797 3229 - voice
> 435 797 1363 - fax
> david.stevens@
> 
> 
> 
> 
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